When the human gene coding for insulin is introduced into a mouse embryo, the gene is correctly expressed in the
appropriate tissue. This shows that:a.
tissue-specific gene expression is highly conserved during evolution.
b. the introduced gene was edited by the mouse embryo for proper function.
c. the introduced gene was exactly the same as the mouse gene for insulin.
d. mice and humans are not closely related.
e. mouse genes are not tissue specific.
a
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Which of the following blood vessels carry CO2-rich (and oxygen-poor) blood back to the heart? Select all correct choices
A. venules B. arterioles C. veins D. arteries E. capillaries
When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. denitrification B. nitrogen fixation C. anammox reaction D. All of the choices are correct.
In vertebrates, the main function of the urinary
system is to
a. rid the body of excess water. b. rid the body of unwanted solutes. c. conserve excess water. d. rid the body of excess water and unwanted solutes. e. do none of these
During transcription, at the point where the DNA strand being copied has an adenine, a(n) _______________ is added to the mRNA.
A) adenine B) thymine C) cytosine D) uracil E) tRNA