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Biology 20
Lecture Quiz #4–Cells/Transport
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.
Just the other day, I told you about a recent article where a man in Germany had leukemia and was HIV
positive. Doctors gave him a bone marrow transplant from and individual who had a genetic mutation where
HIV could not infect his T lymphocytes. As a result of the bone marrow transplant, this man is now in
remission from leukemia and his HIV levels are nonexistent. What was the reason his HIV levels are now
nearly in detectable?
a) the doctors transplanted antiviral drugs also;
b) after the transplant, he did not produce certain membrane proteins;
c) better T-lymphocytes were transplanted;
d) the bone marrow resulted in stronger white blood cells capable of fighting the virus;
e) it was miracle;
ab) the researchers lied about their findings
8. 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???
9. Which of the following is present in prokaryotic cells?
a) ribosomes;
b) mitochondria;
c) nuclear envelope
d) ER;
e) all of these are present.
10. 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.
Use the following key to answer the next three questions:
a) nucleus;
e) lysosome;
b) rough endoplasmic reticulum;
c) smooth endoplasmic reticulum;
d) golgi
ab) mitochondria;
ac) ribosomes;
ad) cell membrane;
ae) none of these.
11. The location where your DNA gets transcribed into RNA so that your cell can make a protein.
12. Your white blood cell just engulfed a bacterium that was introduced into your finger from a splinter. What organelle
inside the white blood cell will “digest” the bacterium?
13. You’re blood sugar level is high after a meal and needs to be lowered. Where will the insulin bind in order to lower
your blood sugar level?
14. Muscle cells require more energy than most other cells in order to function. Therefore, muscle cells would be
expected to have more ________ and ________ than most other cells.
A) glycogen, mitochondria;
B) peroxisomes, fat;
C) mitochondria, triglycerides;
D) ribosomes, glycogen;
E) glucose, nuclei;
AB) nucleus & fat.
15. Some of you may not have eaten breakfast this morning. You blood sugar level is maintained by another
hormone called glucagon. In order for this protein hormone to trigger the breakdown of glycogen to glucose
it must bind to a(n):
a) receptor;
b) enzyme;
c) contractile protein;
d) structural protein;
e) something I don’t know.