In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f). A freckled tongue-roller could have which of the following genotypes?
A. RRFF
B. RrFf
C. rrFF
D. RRFF and RrFf only
E. all of the answer options are correct
D
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Which of the following is not true of gene regulation by DNA looping?
A. The precise distance between the regulatory sequence and the promoter is important. B. It can result in gene repression. C. It can result in gene activation. D. It can result in the regulation of a gene even thousands of base pairs away from the regulatory site.
The reactions of the citric acid cycle take place in the matrix of the mitochondrion
__________________ Indicate whether the statement is true or false.
List the human body's three lines of defense against disease
What will be an ideal response?
Please select the explanation for why the members of the bacterial family Enterobacteriaceae are commonly pathogenic to humans.
A) This family of bacteria commonly inhabits the human body as normal flora. B) Animals have these bacteria as normal flora, and since humans and animals are in close contact, the bacteria are easily transmitted to humans. C) Humans contact these bacteria easily from soil. D) Humans have no inherited resistance to these bacteria. E) As air contaminants, these bacteria easily are transmitted by respiratory route.