The following list describes ways that CRISPR may be used to treat cancer. Which of the following describes immunotherapy instead of CRISPR therapy?
A. Cancer causing mutations within cells may be corrected, preventing cancer from occurring.
B. Cytotoxic T cells may be stimulated, creating an immune response against cancer cells and shrinking tumors.
C. Mutated tumor-suppressor genes may have their previous function restored, allowing normal regulation of cell division.
D. Nucleotides within DNA may be removed, inactivating genes that are responsible for some types of cancer.
E. Mutated proto-oncogenes may have their previous function restored, allowing normal regulation of cell division.
Answer: B
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From an evolutionary perspective, germ-line mutations are more significant than somatic mutations. This is because:
A. somatic mutations affect only one or a few cells. B. somatic mutations are generally harmful. C. only germ-line mutations will appear in an individual's descendants. D. only germ-line mutations are potentially beneficial. E. somatic mutations affect only one or a few cells and only germ-line mutations will appear in an individual's descendants. Answer Point Value: 1.0 points Answer Key: C 5 Remember that, in Mendel's garden peas, the yellow gene determines flower color, with the A (yellow) allele dominant to the a (green) allele. In a population of 200 plants, the genotype frequencies are 50% AA, 25% Aa, and 25% aa. What are the allele frequencies? A. 50% A, 50% a B. 50% A, 25% a C. 87.5% A, 12.5% a D. 62.5% A, 37.5% a E. 75% A, 25% a
Which of the following statements best describes the differences between snakes and lizards?
A. All snakes lack eyelids and all lizards have eyelids. B. All snakes lack external ear openings and all lizards have external ear openings. C. Some snakes are venomous and no lizards are. D. All snakes lack limbs but all lizards have limbs. E. None of the other choices are foolproof and combinations of characteristics are sometimes necessary to distinguish lizards and snakes.
You are trying to determine if honeybees have social immunity to nosema, an economically devastating parasite that attacks adult honeybees. You mark some honeybees with a spot of red dye and expose them to a solution containing a sublethal dose of the parasites. Another set of honeybees is exposed to the same solution without parasites. After this exposure, you mix some of the unmarked bees with
the marked bees (Mixed Group). The rest of the unmarked bees are not mixed with other bees (Unmixed Group). If honeybees can develop social immunity to nosema, what are the expected results of your experiment? A. The marked honeybees will mostly survive, but the unmarked bees of both groups will mostly die. B. The unmarked honeybees in the Mixed Group will have a higher survival rate than those in the Unmixed Group. C. The unmarked honeybees in the Mixed Group will have a lower survival rate than those in the Unmixed Group. D. The unmarked honeybees in the Mixed Group will have a higher survival rate than the marked honeybees. E. There is no way to predict the results based on the information given.
When the frequency of nerve impulses slows or stops even when the stimulus continues at constant
strength, the individual has undergone a. sensory adaptation. b. tolerance. c. perceptive degradation. d. nerve damage. e. tachyphylaxis.