Bio 140 2002 Test 1A Answers Stark
1. One reason that membrane lipids are arranged the way they are is because
(a) essential amino acids.
(b) ionic bonds.
*(c) hydrophobic fatty acids.
(d) hydrolysis of bonds.
(e) the half life.
2. Although people with a genetic predisposition to type II diabetes tend
to be overweight, that, in itself, does not mean that controlling weight
will help to control diabetes. The above statement relates to which statement
about the nature of scientific inquiry?
(a) You cannot prove the null hypothesis.
(b) An advanced course in statistics might be called "experimental
*(c) Correlation does not prove causation.
(d) Models, such as the thermostat model for body temperature homeostasis,
can be good for prediction but do not necessarily describe the mechanism.
(e) There is a fine line between so-called "theories" like evolution
and laws like the law of gravity.
3. You were presented with the classification of the wolf (Animalia - Chordata
- Mammalia - Carnivora - Canidae - Canis - lupis). Which group would have
the most species in it?
4. In the delivery of biological energy
(a) sucrase gets used up when it generates glucose and fructose.
*(b) phosphate is typically transferred from ATP to another molecule.
(c) heat and entropy are captured and stored in ADP.
(d) the end-product feeds back to inhibit the rate-limiting enzyme.
(e) the mitochondria use CO2 to produce O2
5. A reaction that requires oxygen is called
6. A given element with a given integer atomic number might not have an
integer atomic weight because of
*(a) a variable number of neutrons.
(b) a variable number of protons.
(c) unsaturated bonds.
(d) the fact that light excites the electron orbitals.
(e) covalent bonds.
7. Which would have the greatest potential for variability?
(a) a nucleotide 3 base pairs long
*(b) a peptide 3 amino acids long
(c) a hydrocarbon 3 carbons long
(d) a glycogen chain 3 glucose molecules long
8. Those amino acids your metabolism cannot synthesize from other amino
acids are called
9. Certain chemical modifications of a protein are called "post-translational."
(a) Post-translational modifications include "high" levels of
structural organization such as alpha helix vs. beta pleated sheet.
(b) "Post-translational" would be the term applied to the association
of two alpha subunits and two beta subunits in hemoglobin.
(c) "Post-translational" refers to the sequence of amino acids
coded in that protein's "gene" (DNA coding sequence).
(d) For a protein to become an antigen (a non-self protein), it must be
*(e) "Post-translational" is after the manufacture of protein
from a template of mRNA.
10. Steroids are
11. In terms of biological reactions, what is the opposite of dehydration
(b) anabolic metabolism
12. Which does NOT have nitrogen in it?
(a) deoxyribonucleic acid
13. Kilocalories, those "calories" you count when you are dieting,
are a measurement of
(a) water content of food and drink you consume.
(b) amino acid content of food.
*(c) energy available in food.
(d) relative fat content of food.
(e) relative carbohydrate content of food.
14. Which nucleotide base is used in RNA but not DNA?
15. The fundamental function of aerobic respiration in cells is
(a) production of glucose.
*(b) the release of energy.
(c) storage of entropy.
(d) the replication of DNA.
(e) biosynthesis of triglycerides.
16. People with type I diabetes mellitus need to inject insulin
(a) because they have a mutation that puts valine in the 6th amino acid
position of the beta chain of hemoglobin.
*(b) that is a protein hormone.
(c) because it is an enzyme used in digestion.
(d) to replace the missing gonadal steroids.
(e) to activate the sodium-potassium pump.
17. Because of the half-life of 14C, you may be able to determine
(a) whether your solvent is a polar solvent.
(b) whether an organism is a prokaryote or a eukaryote.
(c) whether a reaction is anaerobic.
*(d) the age of a fossil.
(e) number of amino acids in a protein.
18. Enzymes are indicated by the suffix
19. Ribosomes might be situated (A-where?) and serve (B-what function?).
(a) A in the nucleus; B to store genetic information.
(b) A in the Golgi apparatus; B to deliver energy.
*(c) A in the rough endoplasmic reticulum; B to synthesize proteins.
(d) A in the plasmalemma; B to mediate transcription.
(e) A in the desmosome; B to carry the genetic code for each protein.
20. What type of molecule is cellulose?
(b) nucleic acid
(d) polyunsaturated fatty acid
21. Making mRNA from a template of DNA is called
22. Lysosomes would function to
(a) make glucose from CO2 and H2O using energy from light.
(b) modify proteins coming from the endoplasmic reticulum.
(c) allow cells to move ("swim").
*(d) break down membrane-enclosed cellular waste or food.
(e) carry oxygen from the lungs to the tissues.
23. Because of degeneracy of the DNA code,
(a) the HIV retrovirus disobeys central dogma.
(b) most mutations are bad.
(c) both strands can be used for DNA to reproduce itself, but only one strand
can be used to code for a specific protein.
(d) it takes four nucleotides in a row to determine one amino acid.
*(e) it might be possible to have a mutation in the DNA without changing
the protein it codes.
24. A cell's membrane consists principally of two layers of
25. Vegetable oils would be higher (than animal fats) in
*(a) fatty acids with double bonds.
(b) triglycerides in which each acyl group is saturated with as many -H's
(c) all essential amino acids.
(d) uric acid.
26. In which cellular organelle is most of the ATP produced from thorough
(b) rough endoplasmic reticulum
27. Triglycerides with some double bonds are called
28. Which does not have sugar in it?
(b) glycoproteins and glycolipids
29. Which is a purine base of a nucleotide?
(d) lactic acid
30. Which is not true about hemoglobin?
(a) It contains iron.
(b) It is in red blood cells.
(c) It is altered in sickle cell anemia.
*(d) It is an enzyme that makes DNA from a template of mRNA.
(e) It is a protein used for the transport of oxygen.
31. Reactions by which amino acids are used for energy, yielding nitrogenous
wastes, might be referred to as:
32. Which is NOT a carbohydrate?
33. If animal muscle cells are depleted of sufficient levels of oxygen during
use, anaerobic glycolysis will result and pyruvic acid will be converted
*(a) lactic acid.
(b) carbon dioxide.
34. Charged atoms such as Na+ are called
(c) covalent bonds.
35. If a biochemist grinds up liver and isolates microsomes as fraction
in the centrifuge tube, what would this organelle with enzymes for detoxifying
alcohol, drugs or toxins, be as seen in an electron microscope?
*(a) smooth endoplasmic reticulum
(b) tight junction
(c) nuclear envelope
(e) contractile vacuole
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