What organ(s) are more likely to be affected by teratogen exposure in the 16th week?
1.External genitals
2.Heart
3.Palate
4.Upper limbs
1
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Which of the following is in the coding region of a gene?
A. Trailer B. Promoter C. Leader D. None of the choices are correct.
In an anatomy lab, you are shown a skeleton from a sea cucumber, with its internal calcium-rich spines. You would call this a(n)
A. exoskeleton. B. hydrostatic skeleton. C. gastrovascular cavity. D. endoskeleton. E. vascular canal.
How do the strands separate during PCR?
a. The primers separate the strands during the annealing step. b. The DNA polymerase breaks the hydrogen bonds between the two strands. c. The cycling of the temperatures breaks the hydrogen bonds between the two strands. d. The high heat of the denaturation step breaks the hydrogen bonds between the two strands.
Control of the lac operon and lactose utilization in bacteria is (check all that apply)
A. controlled by the expression of three downstream genes. B. not induced in the presence of both glucose and lactose. C. only induced when there is glucose but not lactose. D. preferentially utilizing lactose as a carbon source. E. is a negative control, mediated by a repressor.