Biology 20
Lecture Quiz #–Cells/Transport/Energy
1.
The cells of an ant and an elephant are, on average, the same small size; an elephant just has more of them. What is the
advantage of small cell size?
a) small cells are less likely to burst than large cell;
b) small cells are less likely to be infected by bacteria;
c) small cells can better take up what they need from their environment;
d) it takes less energy to make an organism out of small cells;
e) small cells can "morph" more easily than larger cells.
2.
Which of the following supports the claim the mitochondria developed from bacteria that, long ago, were incorporated into
eukaryotic cells by the process of phagocytosis?
a) Mitochondria has flagella for motion;
b) mitochondria have proteins for synthesis of ATP
c) mitochondria are the “powerhouses” of the cell;
d) mitochondria are easily transported across membranes;
e) mitochondria have their own DNA.
3.
Sodium ions (Na+) diffuse across the cell membrane, but they need assistance. This would be an example of:
a) simple diffusion; b) facilitated diffusion;
c) active transport;
d)osmosis;
e) huh?
4.
You're rushed to the ER and given an IV (intravenous) saline (salt) solution to rehydrate you. The nurse was sleeping during
biology this time and happened to give you an hypotonic IV solution. What would happen to your RBC's (red blood cells) in
your blood vessels?
a) shrivel;
b) lyse/burst;
c) nothing;
d) you're thinking lawsuit aren't you?
5.
[Ca++] is 2.5 mM outside the cell and 0.0001 mM inside the cell. Which direction will the Ca++ ions want to flow?
a) into the cell
b) out of the cell;
c) no net movement into or out of the cell;
d) when did you talk about ion concentrations?
e) none of these are correct.
6.
Which of the following relationships below is incorrect?
a) cell wall = support & protection;
b) chromosomes = genetic control; c) ribosomes = protein synthesis;
d) chloroplasts = chief site of cellular respiration; e) mitochondria = ATP formation;
7.
You decide to do an experiment with celery stalks and osmosis. You immerse celery stalks in freshwater for several hours
become stiff and hard. Similar stalks are left in ocean water become limp and soft. From this you could deduce that the cells
of the celery stalks are:
a) hypotonic to both freshwater and ocean water;
b) hypertonic to both freshwater and ocean water;
c) hypertonic to freshwater, but hypotonic to ocean water;
d) hypotonic to freshwater, but hypertonic to ocean water;
e) where’s that gin and tonic???
8.
Which of the following is present in prokaryotic cells?
a) ribosomes;
b) mitochondria;
c) nuclear envelope;
9.
d) ER;
e) all of these are present.
A plant cell placed in distilled water (100%) will
where as an animal cell placed into distilled water will
.
a) burst...burst;
b) become flaccid...shrivel;
c) become turgid...be normal shaped;
d) become turgid...burst;
e) I have not idea what you're talking about.
10. Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing:
a) chemical energy into kinetic energy;
b) chemical energy into potential energy;
c) kinetic energy into potential energy;
d) kinetic energy into chemical energy.
11. Oxidation is the
, where as reduction is the
.
a) gain of electrons ... loss of electrons; b) loss of electrons ... gain of electrons;
c) loss of oxygen ... gain of oxygen;
d) gain of oxygen ... loss of oxygen.
12. When an enzyme catalyzes a reaction; it?
a) lowers the amount of energy that is required to get the reaction going;
b) raises the amount of energy that is required to get the reaction going;
c) becomes the product of the reaction;
d) acts as the reactant.
13. After you have broken down your breakfast items into simpler products. The chemical reactions that result in the building of
more complex molecules are referred to as
reactions.
a) anabolic; b) catabolic;
c) dehydration; d) none of these.
14. A reaction is designated as exergonic rather than endergonic when ___________.
a) activation energy exceeds net energy release;
b) activation energy is necessary;
c) no kinetic energy is released;
d) the potential energy of the products is less than the potential energy of the reactants;
e) it absorbs more energy.
15. Which of these is exhibiting kineticenergy?
a) a rock on a mountain ledge;
b) the high energy phosphate bonds of ATP;
c) an archer with a flexed bow;
d) a space station orbiting Earth;
e) a person sitting on a couch while watching TV.
16. Which of the following do enzymes work on?
a) substrates;
b) products;
c) inhibitors;
d) competitive inhibitors; e) dynamite.
17. You’ve cut your finger and your body repairs it. What type of reaction just occurred?
a) endergonic & anabolic;
b) endergonic & catabolic;
c) exergonic & anabolic;
d) endergonic & catabolic;