New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Subject: Biology
Topic: Translation.
Section: .......... Date:...................................
I
Q1. Circle the word or phrase that best completes the statement.
1. Ribosomes / Vesicles and tRNA molecules / DNA polymerase are the tools that help a cell
translate an mRNA message into a polypeptide
2. The small / large subunit of a ribosome holds onto the mRNA strand.
3. The small / large subunit of a ribosome has binding sites for tRNA.
4. A tRNA molecule is attached to a(n) sugar / amino acid at one end and has a(n) frame /
anticodon at the other end.
Q2. Fill in the blank with the word or phrase that best completes the sentence.
1. Translation is the process that converts an mRNA message into a _____________.
2. A codon is a sequence of ________ nucleotides that code for an amino acid.
3. A reading frame is the order in which _____________ are read.
4. AGG, GCA, and GUU are examples of _________________.
5. A(n) __________ is a set of three nucleotides on a tRNA molecule that is complementary to
an mRNA codon.
6. A ______________ indicates where translation is to stop.
Q3. Place the following sentences into the cycle diagram below to outline the steps of
translation.
i. The ribosome pulls the mRNA strand the length of one codon. The first tRNA exits the
ribosome, and another codon is exposed.
ii. The ribosome forms a peptide bond between the amino acids. It breaks the
between the first amino acid and tRNA.
iii. An exposed codon attracts a complementary tRNA bearing an amino acid.
A.
Ribosome assembles at
the start codon of
mRNA strand.
C.
B.
When the ribosome
encounters a stop
codon, it falls apart and
the protein is released.
bond
New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Subject: Biology
Topic: Translation.
Section: .......... Date:...................................
II
Q4. Choose the letter of the best answer.
1. What is the term for a three-nucleotide sequence that codes for an amino acid?
a. base
b. codon
c. amine
d. serine
2. How many amino acids are used to make up the all of the proteins in the human body?
a. 16
b. 20
c.23
d. 46
3. A tRNA that carries the amino acid methionine pairs with which type of codon?
a. serine codon
b. tRNA codon
c. start codon
d. anticodon
4. Which phrase best describes translation?
a. converts mRNA into a polypeptide
c. produces RNA from DNA molecules
b. catalyzes bonds between amino acids
d. recycles tRNA molecules for reuse
5. Which of the following is the site of translation?
a. vacuole
b. lysosome
c. nucleus
d. ribosome
Q5. Answer the following questions with proper reasoning.
1. What is a codon?
_________________________________________________________________
_________________________________________________________________
2. What role does tRNA play in translation?
_________________________________________________________________
_________________________________________________________________
3. What forms the bond between neighboring amino acids?
_________________________________________________________________
4. What are AGG, GCA, and GUU examples of?
_________________________________________________________________
5. What is a set of three nucleotides on a tRNA molecule that is complementary to an mRNA
codon?
_________________________________________________________________
6. What is a reading frame?
_________________________________________________________________
New World American PVT School
‫مدرسة العالم الجديد األمريكية الخاصة‬
Name:.......................................................................................... Grade: 11
Subject: Biology
Topic: Translation.
Q6. Complete the following diagram.
Q7. Refer to Figure 5.1 to complete the table below.
Codon
Amino Acid or Function
1. AGA
2. UAG
3.
4. GGA
tryptophan (Trp)
Section: .......... Date:...................................
III