Chapter 3
Practice quiz
1. T F Phospholipids contain both polar and non-polar portions.
2. T F Integral proteins that go completely through the plasma membrane are called transmembrane proteins.
3. T F On the outside of the plasma membrane are polysaccharides that may act as receptors.
4. T F A ligand is a specific molecule that binds to a receptor.
5. T F The fluidity of a membrane is increased by cholesterol at normal body temperatures.
6. T F Typically the inside of the plasma membrane is positive in charge.
7. T F Diffusion is always from an area of high concentration to an area of low concentration.
8. T F A cell placed in a hypotonic solution will swell to the point of bursting.
9. T F Most non-polar substances diffuse into or out of the plasma membrane through membrane channels.
10. T F Secondary active transport always relies on primary active transport to continue functioning.
11. T F All
of the following are examples active transport except:
A. endocytosis
B. exocytosis
C. pinocytosis
D. osmosis
E. phagocytosis
12. In receptor-mediated
endocytosis molecules of clathrin are found inside
A. the plasma membrane pits
B. transport vesicles
C. lysosomes
D. all of the above
E. none of the above
13. The smallest filamentous
structures are:
A. microtubules
B. microfilaments
C. intermediate filaments
D. none of the above
14. The structure which
organizes microtubules is the:
A. cilia
B. flagella
C. tubulin
D. centriole
E. centromere
15. The organelle involved
with protein synthesis is the:
A. ribosome
B. peroxisome
C. smooth enfoplasmic reticulum
D. Golgi complex
E. Proteasome
16. The organelle that causes
autophagy is the:
A. peroxisome
B. proteasome
C. mitochondria
D. nucleus
E. none of the above
17. The organelle linked
to Tay-Sachs disease is the:
A. proteasome
B. peroxisome
C. mitochondria
D. lysosome
E. none of the above
18. The codon for methionine
is:
A. AUG
B. UAC
C. TAT
D. UAA
E. none of the above
19. The stage of mitosis
where chromosomes line up on the equatorial plane is:
A. prophase
B. telophase
C. interphase
D. metaphase
E. anaphase
20. The stage of the cell
cycle susceptible to methotrexate is:
A. S
B. G1
C. G2
D. all of the stages are equally affected
E. none of the above