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Questions part 1: Keimzellen und Befruchtung
Due: 12:00pm on Wednesday, December 7, 2011
Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy
Chapter 13 Pre-Test Question 1
Description: (a) Asexual reproduction _____.
Part A
Asexual reproduction _____.
Hint A.1
The prefix "a-" means "without."
ANSWER:
requires both meiosis and mitosis
produces offspring genetically identical to the parent
is limited to single-cell organisms
is limited to plants
leads to a loss of genetic material
Only one individual makes a genetic contribution to the offspring.
Chapter 13 Pre-Test Question 2
Description: (a) What number and types of chromosomes are found in a human somatic cell?
Part A
What number and types of chromosomes are found in a human somatic cell?
Hint A.1
Somatic cells are diploid.
ANSWER:
44 autosomes and 2 sex chromosomes
22 autosomes and 1 sex chromosome
45 autosomes and 1 sex chromosome
n chromosomes
21 autosomes and 2 sex chromosomes
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Human somatic cells contain 22 pairs of autosomes and either two X chromosomes (in
females) or an X and a Y chromosome (in males).
Chapter 13 Question 3
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Which of the following defines a
genome?
Part A
Which of the following defines a genome?
ANSWER:
a karyotype
representation of a complete set of a cell's polypeptides
the complete set of an organism's genes
the complete set of a species' polypeptides
the complete set of an organism's polypeptides
Chapter 13 Pre-Test Question 5
Description: (a) How are sister chromatids and homologous chromosomes different from each
other?
Part A
How are sister chromatids and homologous chromosomes different from each other?
Hint A.1
Which type of chromosomes are identical copies and which are similar?
ANSWER:
They are not different. Homologous chromosomes and sister
chromatids are both identical copies of each other.
Homologous chromosomes contain the same gene loci but may have
different alleles of a particular gene. Sister chromatids are identical
copies of each other produced during DNA replication.
Homologous chromosomes are identical copies of each other. One
sister chromatid comes from the father, and one comes from the
mother.
Homologous chromosomes are closely associated with each other in
both mitosis and meiosis. Sister chromatids are only associated with
each other during mitosis.
Sister chromatids are only formed during mitosis. Homologous
chromosomes are formed during meiosis.
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One homologous chromosome comes from the father, and the other comes from the mother.
Sister chromatids are identical copies of each other.
Chapter 13 Question 2
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Which of the following is a true
statement about sexual vs. asexual reproduction?
Part A
Which of the following is a true statement about sexual vs. asexual reproduction?
ANSWER:
Asexual reproduction, but not sexual reproduction, is characteristic of
plants and fungi.
In sexual reproduction, individuals transmit 50% of their genes to each
of their offspring.
In asexual reproduction, offspring are produced by fertilization without
meiosis.
Sexual reproduction requires that parents be diploid.
Asexual reproduction produces only haploid offspring.
Chapter 13 Question 6
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Eukaryotic sexual life cycles
show tremendous variation. Of the following elements, which do all sexual life cycles have in
common? I. Alternation of generations II. Meiosis III. Fertilizati...
Part A
Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all
sexual life cycles have in common?
I. Alternation of generations
II. Meiosis
III. Fertilization
IV. Gametes
V. Spores
ANSWER:
II, III, and IV
I, IV, and V
I, II, III, IV, and V
I, II, and IV
II, IV, and V
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Chapter 13 Question 7
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Which of these statements is
false?
Part A
Which of these statements is false?
ANSWER:
In humans, the 23rd pair, the sex chromosomes, determines whether
the person is female (XX) or male (XY).
At sexual maturity, ovaries and testes produce diploid gametes by
meiosis.
Sexual life cycles differ with respect to the relative timing of meiosis
and fertilization.
Single, haploid (n) sets of chromosomes in ovum and sperm unite
during fertilization, forming a diploid (2n), single-celled zygote.
In humans, each of the 22 maternal autosomes has a homologous
paternal chromosome.
Chapter 13 Question 15
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Which of the following can
utilize both mitosis and meiosis in the correct circumstances?
Part A
Which of the following can utilize both mitosis and meiosis in the correct circumstances?
ANSWER:
any diploid animal cell
an archaebacterium
a plantlike protist
a haploid animal cell
a diploid cell from a plant stem
Chapter 13 Question 44
Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) Refer to the life cycles illustrated in the
figure to answer the following question. In part III of the figure, the progression of events
corresponds to which of the following series?
Part A
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Refer to the life cycles illustrated in the figure to answer the following question.
In part III of the figure, the progression of events corresponds to which of the following series?
ANSWER:
zygote, mitosis, gametophyte, mitosis, fertilization, zygote, mitosis
gametophyte, meiosis, zygote, spores, sporophyte, zygote
fertilization, mitosis, multicellular haploid, mitosis, spores, sporophyte
sporophyte, meiosis, spore, mitosis, gametophyte, mitosis, gametes,
fertilization
meiosis, fertilization, zygote, mitosis, adult, meiosis
Chapter 13 Pre-Test Question 6
Description: (a) Mitosis results in the formation of how many cells; meiosis results in the formation
of how many cells?
Part A
Mitosis results in the formation of how many cells; meiosis results in the formation of how many
cells?
Hint A.1
Consider the different functions of mitosis and meiosis.
ANSWER:
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four diploid cells ... four haploid cells
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two diploid cells ... two diploid cells
two diploid cells ... four haploid cells
four haploid cells ... two diploid cells
two diploid cells ... two haploid cells
In mitosis a cell that has doubled its genetic material divides to produce two diploid daughter
cells. In meiosis a cell that has doubled its genetic material undergoes two rounds of division,
producing four haploid cells.
Chapter 13 Pre-Test Question 7
Description: (a) Which of the following occurs during meiosis but not during mitosis?
Part A
Which of the following occurs during meiosis but not during mitosis?
Hint A.1
Think about the different purposes and end products of mitosis and meiosis.
ANSWER:
Chromosomes condense.
Chromosomes migrate to opposite poles.
Chromosomes align at the metaphase plate.
A spindle apparatus forms.
Synapsis occurs.
The pairing of homologous chromosomes that only occurs during prophase I of meiosis is
called synapsis.
Chapter 13 Pre-Test Question 8
Description: (a) What is crossing over?
Part A
What is crossing over?
Hint A.1
Crossing over occurs during prophase I.
ANSWER:
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a direct consequence of the separation of sister chromatids
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also referred to as the "independent assortment of chromosomes"
making an RNA copy of a DNA strand
the movement of genetic material from one chromosome to a
nonhomologous chromosome
the exchange of homologous portions of nonsister chromatids
The result is new combinations of genetic material (genetic recombination).
Chapter 13 Question 10
Description: [[Bloom's Taxonomy: Synthesis/Evaluation ]] (a) The karyotype of one species of
primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one
of her eggs with an extra chromosome (25). The most probable source of...
Part A
The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division
goes awry and she produces one of her eggs with an extra chromosome (25). The most probable
source of this error would be a mistake in which of the following?
ANSWER:
either anaphase I or II
metaphase I of one meiotic event
telophase II of one meiotic event
mitosis in her ovary
telophase I of one meiotic event
Chapter 13 Question 14
Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) If a cell has completed the first meiotic
division and is just beginning meiosis II, which of the following is an appropriate description of its
contents?
Part A
If a cell has completed the first meiotic division and is just beginning meiosis II, which of the
following is an appropriate description of its contents?
ANSWER:
It is identical in content to another cell from the same meiosis.
It has half the amount of DNA as the cell that began meiosis.
It has the same number of chromosomes but each of them has different
alleles than another cell from the same meiosis.
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It has one-fourth the DNA and one-half the chromosomes as the
originating cell.
It has half the chromosomes but twice the DNA of the originating cell.
Chapter 13 Question 20
Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) How do cells at the completion of
meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?
Part A
How do cells at the completion of meiosis compare with cells that have replicated their DNA and are
just about to begin meiosis?
ANSWER:
They have twice the amount of cytoplasm and half the amount of DNA.
They have the same number of chromosomes and half the amount of
DNA.
They have half the number of chromosomes and one-fourth the amount
of DNA.
They have half the number of chromosomes and half the amount of
DNA.
They have half the amount of cytoplasm and twice the amount of DNA.
Chapter 13 Question 25
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Which of the following occurs in
meiosis but not in mitosis?
Part A
Which of the following occurs in meiosis but not in mitosis?
ANSWER:
production of daughter cells
condensation of chromatin
synapsis of chromosomes
alignment of chromosomes at the equator
chromosome replication
Chapter 13 Question 27
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Description: [[Bloom's Taxonomy: Synthesis/Evaluation ]] (a) Whether during mitosis or meiosis,
sister chromatids are held together by proteins referred to as cohesins. Such molecules must have
which of the following properties?
Part A
Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as
cohesins. Such molecules must have which of the following properties?
ANSWER:
They must be removed before sister chromatids or homologous
chromosomes can separate.
They must be removed before meiosis can begin.
They must reattach to chromosomes during G1.
They must be intact for nuclear envelope re-formation.
They must persist throughout the cell cycle.
Chapter 13 Pre-Test Question 9
Description: (a) Genetic variation occurs when chromosomes are shuffled in fertilization and what
other process?.
Part A
Genetic variation occurs when chromosomes are shuffled in fertilization and what other process?.
Hint A.1
Consider how mitosis and meiosis differ.
ANSWER:
mutation
genetic drift
natural selection
meiosis
mitosis
Variation is produced as a result of independent assortment and crossing over.
Chapter 13 Misconception Question 2
Part A
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Look at the cell in the figure. Based on this figure, which of the following statements is true?
ANSWER:
This cell is diploid.
It is impossible to tell whether the cell is haploid or diploid.
This cell is haploid.
This is correct. Read Concept 13.2 and continue to Question 3, below.
Chapter 13 Misconception Question 3
Part A
What is the best evidence telling you whether this cell is diploid or haploid?
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The cell is diploid because each chromosome consists of two
chromatids.
The cell is diploid because it contains two sets of chromosomes.
The cell is haploid because the chromosomes are not found in pairs.
Correct! Only diploid cells contain two sets of chromosomes, one maternal and one paternal.
Read about diploid cells in Concept 13.2.
Chapter 13 Misconception Question 4
Part A
This chromosome has two chromatids, joined at the centromere. What process led to the formation
of the two chromatids?
ANSWER:
The two chromatids were formed by fertilization, bringing together
maternal and paternal chromatids.
The two chromatids were formed by synapsis and the formation of a
synaptonemal complex.
The two chromatids were formed by replication of the DNA within a
single chromatid.
Correct! Read Concept 13.2.
Chapter 13 Misconception Question 5
Part A
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Two sister chromatids are joined at the centromere prior to meiosis. Which statement is correct?
ANSWER:
The cell that contains these sister chromatids must be diploid.
These chromatids make up a diploid chromosome.
Barring mutation, the two sister chromatids must be identical.
Yes, this is correct. Unless there are replication errors known as mutations, DNA replication and
chromosome duplication produce a chromosome consisting of two genetically identical
chromatids. Read Concept 13.2.
Chapter 46 Pre-Test Question 2
Description: (a) Sexual reproduction includes a reproductive pattern called _____.
Part A
Sexual reproduction includes a reproductive pattern called _____.
Hint A.1
Consider which of these requires two individuals.
ANSWER:
hermaphroditism
budding
fragmentation
fission
regeneration
In hermaphroditism a single individual produces both sperm and ova; although some
individuals fertilize themselves, most must mate with another member of the same species.
Chapter 46 Pre-Test Question 6
Description: (a) The "reproductive handicap" for sexual reproduction refers to _____.
Part A
The "reproductive handicap" for sexual reproduction refers to _____.
Hint A.1
Contrast the genetic results of asexual and sexual reproduction.
ANSWER:
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the need to provide energy for the offspring
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diluted genetic investment in offspring
the difficulty of finding mates
the need for maturation prior to reproduction
dependence on hormonal cycles
A female undergoing asexual reproduction would have offspring that have 100% of her genes,
whereas a sexually reproducing female typically passes only 50% of her genetic material to her
offspring.
Chapter 46 Question 4
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Genetic mutations in asexually
reproducing organisms lead to more evolutionary change than do genetic mutations in sexually
reproducing ones because...
Part A
Genetic mutations in asexually reproducing organisms lead to more evolutionary change than do
genetic mutations in sexually reproducing ones because
ANSWER:
sexually reproducing organisms can produce more offspring in a given
time than can sexually reproducing organisms.
asexually reproducing organisms, but not sexually reproducing
organisms, pass all mutations on to their offspring.
asexually reproducing organisms devote more time and energy to the
process of reproduction than do sexually reproducing organisms.
more genetic variation is present in organisms that reproduce
asexually than is present in those that reproduce sexually.
asexually reproducing organisms have more dominant genes than
organisms that reproduce sexually.
Chapter 46 Question 5
Description: [[Bloom's Taxonomy: Synthesis/Evaluation ]] (a) Asexual reproduction results in greater
reproductive success than does sexual reproduction when...
Part A
Asexual reproduction results in greater reproductive success than does sexual reproduction when
ANSWER:
a species is expanding into diverse geographic settings.
there is some potential for rapid overpopulation.
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pathogens are rapidly diversifying.
a species is in stable and favorable environments.
a species has accumulated numerous deleterious mutations.
Chapter 46 Question 6
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Sexual reproduction patterns
include the example of...
Part A
Sexual reproduction patterns include the example of
ANSWER:
hermaphroditism.
fission.
parthenogenesis.
fragmentation.
budding.
Chapter 46 Pre-Test Question 8
Description: (a) In humans, oogenesis in comparison to spermatogenesis is different in that _____.
Part A
In humans, oogenesis in comparison to spermatogenesis is different in that _____.
Hint A.1
Think of the products and timing of the stages of meiosis in oogenesis and spermatogenesis.
ANSWER:
oocyte production works best at cooler temperatures than those that
support spermatogenesis
oogenesis continues throughout life, but spermatogenesis typically
ends at age 55 years
female puberty typically occurs much later than the age of male puberty
oogenesis does not complete meiosis until after fertilization, but
spermatogenesis is complete before the sperm leave the body
the names and chemical identities of the pituitary hormones are
completely different between males and females
This is true. The second division is completed only after a sperm penetrates the egg. But is this
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the only correct answer?
Chapter 46 Question 14
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Animals with reproduction
dependent on internal fertilization need not have...
Part A
Animals with reproduction dependent on internal fertilization need not have
ANSWER:
behavioral interaction between males and females.
any copulatory organs.
haploid gametes.
a receptacle that receives sperm.
internal development of embryos.
Chapter 46 Question 35
Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) In vertebrate animals, spermatogenesis
and oogenesis differ in that...
Part A
In vertebrate animals, spermatogenesis and oogenesis differ in that
ANSWER:
spermatogenesis is not completed until after fertilization occurs, but
oogenesis is completed by the time a girl is born.
oogenesis ends at menopause, whereas spermatogenesis is finished
before birth.
oogenesis begins at the onset of sexual maturity, whereas
spermatogenesis begins during embryonic development.
cytokinesis is unequal in oogenesis, whereas it is equal in
spermatogenesis.
oogenesis produces four haploid cells, whereas spermatogenesis
produces only one functional spermatozoon.
Chapter 46 Question 36
Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) Mature human sperm and ova are
similar in that they...
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Part A
Mature human sperm and ova are similar in that they
ANSWER:
are approximately the same size.
both have the same number of chromosomes.
each have a flagellum that provides motility.
are produced from puberty until death.
are formed before birth.
Chapter 46 Pre-Test Question 9
Description: (a) The anatomical location for the typical union of a sperm and an egg (conception) is
the _____.
Part A
The anatomical location for the typical union of a sperm and an egg (conception) is the _____.
Hint A.1
Think about where the egg goes at the point of ovulation.
ANSWER:
oviducts
clitoris
vagina
uterus
ovaries
Ovulation releases the eggs into the abdominal cavity, where they are swept into the oviduct.
Chapter 46 Question 44
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) A primary response by the
Leydig cells in the testes to the presence of luteinizing hormone is an increase in the synthesis and
secretion of...
Part A
A primary response by the Leydig cells in the testes to the presence of luteinizing hormone is an
increase in the synthesis and secretion of
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oxytocin.
progesterone.
inhibin.
testosterone.
prolactin.
Chapter 46 Question 53
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) For normal human fertilization
to occur,...
Part A
For normal human fertilization to occur,
ANSWER:
only one sperm need penetrate one egg.
the secondary oocyte must implant in the uterus.
the uterus must be enlarged.
many ova must be released.
secretion of pituitary FSH and LH must decrease.
Chapter 46 Question 54
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Fertilization of human eggs
usually takes place in the...
Part A
Fertilization of human eggs usually takes place in the
ANSWER:
oviduct.
cervix.
uterus.
ovary.
vagina.
Chapter 46 Question 7
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Description: [[Bloom's Taxonomy: Application/Analysis ]] (a) For which of the following is the
number the same in spermatogenesis and oogenesis?
Part A
For which of the following is the number the same in spermatogenesis and oogenesis?
ANSWER:
meiotic divisions required to produce each gamete
different cell types produced by meiosis
gametes produced in a given time period
functional gametes produced by meiosis
interruptions in meiotic divisions
Chapter 46 Misconception Question 1
Part A
Select the correct statement about reproduction and eukaryotic life cycles.
ANSWER:
In all eukaryotic life cycles, the products of meiosis are gametes.
Some animal adults are haploid.
Animal reproduction is exclusively sexual.
Yes, that is correct. Although the great majority of adult animals are diploid, a few (such as
male honeybees or drones) are haploid. Read about parthenogenesis in Concept 46.1.
Chapter 46 Misconception Question 2
Part A
What is the fundamental difference between male and female vertebrates?
ANSWER:
A plant seed and a bird egg
Male and female vertebrates are genetically distinct.
Males produce many, motile gametes and females produce few,
stationary gametes.
Correct! Read about this fundamental difference in Concept 46.1.
Chapter 47 Pre-Test Question 2
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Description: (a) Among the following, the earliest consequence of the acrosomal reaction is _____.
Part A
Among the following, the earliest consequence of the acrosomal reaction is _____.
Hint A.1
The acrosomal reaction begins as a result of sperm-binding receptors on the egg binding to
proteins on the sperm.
ANSWER:
the cortical reaction
the slow block to polyspermy
the development of the fertilization envelope
cleavage
the membrane of the egg depolarizing
Fusion of the membranes of the egg and sperm causes membrane depolarization, known as
the "fast" block to polyspermy, i.e., the prevention of additional sperm binding to the egg.
Chapter 47 Question 4
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Contact of a sperm with signal
molecules in the coat of an egg causes the sperm to undergo...
Part A
Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo
ANSWER:
vitellogenesis.
mitosis.
apoptosis.
the acrosomal reaction.
depolarization.
Chapter 47 Question 6
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) The formation of the fertilization
membrane requires an increase in the availability of...
Part A
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The formation of the fertilization membrane requires an increase in the availability of
ANSWER:
bicarbonate ions.
calcium ions.
hydrogen ions.
potassium ions.
sodium ions.
Chapter 47 Question 15
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) The cortical reaction functions
directly in the...
Part A
The cortical reaction functions directly in the
ANSWER:
generation of a nerve-like impulse by the egg cell.
fusion of egg and sperm nuclei.
production of a fast block to polyspermy.
formation of a fertilization envelope.
release of hydrolytic enzymes from the sperm cell.
Chapter 47 Question 17
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) In an egg cell treated with
EDTA, a chemical that binds calcium and magnesium ions, the...
Part A
In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the
ANSWER:
zygote would not contain maternal and paternal chromosomes.
fast block to polyspermy would not occur.
fusion of sperm and egg nuclei would be blocked.
acrosomal reaction would be blocked.
fertilization envelope would not be formed.
Chapter 47 Question 19
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Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) Fertilization normally...
Part A
Fertilization normally
ANSWER:
reinstates diploidy.
merges two diploid cells into one haploid cell.
follows gastrulation.
precedes ovulation.
is required for parthenogenesis.
Chapter 47 Question 20
Description: [[Bloom's Taxonomy: Knowledge/Comprehension ]] (a) In mammalian eggs, the
receptors for sperm are found in the...
Part A
In mammalian eggs, the receptors for sperm are found in the
ANSWER:
mitochondria of the egg.
cytosol of the egg.
fertilization membrane.
zona pellucida.
nucleus of the egg.
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