Is a clone genetically identical to its parent(s)?
A. Yes, a clone is genetically identical to its single parent (the donor of the nucleus).
B. No, a clone has its own set of genetic differences from its parent.
C. Yes, a clone is genetically identical to both of its parents (the donor of the nucleus, and the donor of the cell in which it grew).
D. No, a clone is only genetically identical to the donor of the cell in which it grew.
Answer: A
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It has been observed that when the sugar source changes in a growth medium, the growth rate of yeast vary widely in response. Some strains of yeast are slow to induce catabolic operons while other strains quickly synthesize proteins to process the new sugar. What might be one explanation for this difference in the growth rate of the strains?
A. Operons for anabolic pathways are controlled by many global regulatory mechanisms, and different sugars can favor initiation of different pathways depending on the strain of yeast. B. Different sugars can act as effector or repressor molecules in various strains, promoting or inhibiting transcription of genes depending on the type of sugar present. C. Catabolic repression strategies of operons for using different sugars may vary among strains, thereby favoring initiation of transcription in one strain over another depending on the sugar. D. All of the choices are correct.
M. catarrhalis can be described as a:
a. gram-positive diplococcus. b. gram-negative diplococcus. c. gram-negative coccobacillus. d. gram-negative bacillus.
Which of the following do virtually all scientists agree is occurring?
a. the distribution of populations is shrinking globally d. the Earth’s atmosphere and oceans are getting steadily warmer b. the distribution of polar species will contract to lower latitudes e. the biosphere is shrinking c. global warming will not change the timing of important biological events
____________________ are mutations involving the increase of the number of repeat sequences in
genes. Fill in the blank(s) with the appropriate word(s).