26. The molecule diagrammed on the right is
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EXAMPLE EXAM QUESTIONS
UNIT III: CELL BIOLOGY
1. A nucleolus is
a. a membrane bounded organelle
b. found only in a dividing cell
c. found within the mitochondria
d. composed of ribosomal subunits
e. all of the above
2. What is the monomer that makes up proteins?
a. glucose
b. carbon
c. phosphate
d. glycogen
e. amino acid
3. What characteristics does the element carbon have that makes it the basis of life on earth?
a. it floats on water when frozen
b. has considerable amounts of energy available
c. can form long chains or ring compounds
d. acts as a lubricant
e. can carry oxygen
4. In mitochondria, the infoldings of the inner membrane are called
a. cristae
b. thylakoids
c. grana
d. endoplasmic reticulum
e. lamellae
5. Which of the following is NOT correct?
a. nuclear membrane is absent in prokaryotes but present in eukaryotes.
b. in prokaryotes, DNA is not attached to a protein.
c. in eukaryotes, DNA is attached to a protein.
d. ribosomes are present in both prokaryotes and eukaryotes.
e. both prokaryotes and eukaryotes possess vacuoles.
6. When red blood cells are placed in hypotonic solutions, they
a. shrink.
b. wrinkle.
c. tinkle.
d. remain the same.
e. swell.
7. Diffusion is the process by which a substance moves from an area
of
a. higher concentration to an area of lower concentration.
b. lower concentration to an area of higher concentration.
c. higher temperature to an area of lower temperature.
d. lower temperature to an area of higher temperature.
e. all of the above are correct.
8. Which of the following proteins IS an enzyme?
a. glycogen
b. insulin
c. cellulose
d. chitin
e. phospholipid
9. Which of the following is found in animal cells
a. cell wall
b. chloroplast
c. lysosome
d. centriole
e. c and d above
10. How are starch, cellulose and glycogen all different from one
another?
a. starch contains no nitrogen atoms
b. they are all non-polar
c. by their branching patterns
d. cellulose is composed of a number of glucose monomers joined together
e. glycogen and cellulose are formed by plants, starch is formed by animals.
11. What are the four most abundant elements in the human body?
a. C, H, O and N
b. water, glucose, oxygen and carbon dioxide
c. carbohydrates, lipids, proteins and nucleic acids
d. S, P, C and CI
e. hydrogen, sodium, potassium and nitrogen
12. Cristae are the site of
a. protein synthesis
b. electron transport chain
c. the Kreb's cycle
d. light independent reaction
e. light dependent reaction
13. Which of the following is a membrane bounded organelle?
a. vacuole
b. chloroplast
c. mitochondria
d. nucleus
e. all of the above are membrane bounded
14. In protein synthesis, the forming of an alpha helix is by means
of
a. a mutation
b. disulfide bonds
c. hydrogen bonds
d. ionic bonds
e. hydrolysis
15. Lysosomes
a. release enzymes into food vacuoles
b. are membrane bounded
c. contain powerful digestive enzymes
d. are produced by the Golgi body
e. all of the above
16. Chromosomes are
a. membrane bounded organelles in eukaryotes
b. a group of ribosomal subunits
c. found in the prokaryotic cells
d. structures that contain the genetic information of the bacterial cell
e. composed of DNA attached to protein
17. The light independent reaction occurs
a. only at night or in the dark
b. in the light or dark
c. in the grana and produces sugar as a form of carbon dioxide fixation
d. in the stroma and produces considerable ATP
e. two of the above
18. What makes up the cytoskeleton of cells?
a. carbohydrates and lipids
b. cilia and flagella
c. membranes and plasma
d. microtubules and microfilaments
e. bone and cartilage
19. When the surface shape of an enzyme is changed by heat and rendered
nonfunctional, the change is called
a. hydrolysis
b. dehydration synthesis
c. crenation
d. hemolysis
e. denaturation
20. Amino acids are the monomers for which compounds?
a. lipids
b. carbohydrates
c. proteins
d. glycogen
e. amino acids
21. Which of the following is NOT enclosed in a double membrane?
a. mitochondria
b. chloroplast
c. nucleus
d. vacuole
e. all of the above are enclosed in double membranes
22. The Krebs cycle, when NAD picks up and carries hydrogen
a. occurs in the lumen of the mitochondria
b. is part of the process called glycolysis
c. takes place in the grana
d. considerable amount of ATP is produced
e. is also called oxidation phosphorylation
23. A long chain of amino acids that just formed on the surface of
a ribosome is known as
a. the tertiary structure of a protein
b. an enzyme
c. a polypeptide
d. an alpha helix
e. the secondary structure of a protein
24. A function of water that has biological importance with respect
to organisms is
a. that ice floats.
b. having surface tension.
c. that warm water is less dense than cold water.
d. that it acts as a lubricant.
e. all of the above are important biologically.
25. The function of ribosomes is the
a. production of ATP
b. site of enzyme synthesis
c. production of secretory vesicles
d. site of protein synthesis
e. b and d above
26. The molecule diagrammed on the right is
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27. A substance that consists of only one type of atom is BEST exemplified by
a. an element
b. a mixture
c. a compound
d. a molecule
e. water
28. The light dependent reactions of photosynthesis takes place within
the
a. plasma membrane of the cell.
b. membranes of the mitochondria.
c. the stacks of membranes (thylakoids) in the grana.
d. the outer membrane of the chloroplast.
e. the semi-fluid stroma of the chloroplast.
29. Ribosomes are found attached to membranes of the
a. rough endoplasmic reticulum
b. mitochondria
c. nucleus
d. secretory vesicle
e. Golgi body
30. Which of the following IS a carbohydrate?
a. amino acid
b. glycerol
c. cellulase
d. chitin
e. hemoglobin
31. Glycerol and a fatty acid can be joined together by means of
a. digestion
b. hydrolysis
c. hydrogen bonds
d. removing water
e. disulfide bonds
32. For which of the following atomic numbers, would an atom have
to lose 2 electrons and be chemically stable?
a. 1
b. 12
c. 8
d. 10
e. 16
33. Which of the following are the most abundant proteins?
a. phospholipids
b. cellulose
c. microtubules
d. actin and myosin
e. enzymes
34. What prevents the lakes of colder parts of the world from freezing
solid from bottom up?
a. water in the solid form is at the maximum density
b. surface tension keeps the ice floating
c. that warm water is less dense than cold water
d. wind causes mixing of the water
e. ice is less dense than liquid water at any temperature
35. What causes one end of a phospholipid to be hydrophilic?
a. it is a symmetrical part of the molecule
b. it is polar
c. it consists entirely of carbon and hydrogen
d. an attraction to lipids
e. it is composed of ionic bonds
