In the first step of their experiments, Jacob and Monod treated E. coli cells with ultraviolet light or X-rays to _____
A) decrease the rate of gene expression
B) induce DNA repair enzymes
C) increase the frequency of mutations in all genes
D) selectively mutate the lac operon, leaving all other genes unmutated
Answer: C
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The type strain is the most representative strain of a particular species.
Answer the following statement true (T) or false (F)
The ultimate goal of sexual reproduction is to produce genetic ________ in offspring and in the population
Fill in the blank(s) with the appropriate word(s).
Photosynthesis uses carbon from carbon dioxide. What ultimately happens to the carbon?
1.It is released as sugar. 2.It is incorporated into the organism as tissues, energy sources, and structural components. 3.It is released as energy during cellular respiration. 4.It is released as nutrients into the soil.
Jane is a 20-year-old individual who externally resembles a female but who is actually genetically a male (XY). Based on your knowledge of human development, how could this be possible?
A) Although Jane is genetically a male, she has produced an abnormal amount of estrogen since birth. B) During development, Jane's body produced an excessive amount of testosterone, leading to the development of female external genitalia. C) Jane's embryonic gonads did not produce androgens, or they lacked functional testosterone receptors. D) Due to a genetic defect, Jane lacks sufficient aromatase activity, the enzyme that converts testosterone into estrogen.