Which of the following statements apply to freshwater fish?
A) They lose water by osmosis.
B) The concentration of solutes in their internal fluids is lower than in the surrounding water.
C) They pump out ions via the gills.
D) They produce dilute urine.
Ans: D) They produce dilute urine.
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The first oncogene to be discovered:
A. is a gene that contributes to uncontrolled cell division or cancer. B. was first discovered in a Rous sarcoma virus that causes cancer. C. is a protein kinase that acts as a cell division trigger. D. has a less-active normal counterpart called a proto-oncogene. E. All of these choices are correct.
Where will RNA polymerase bind to a prokaryotic operon to initiate transcription if a repressor is absent?
a. transcriptional start site b. promoter c. operator d. coding region
Explain why grandsons of boys who survived a famine lived longer than grandsons of boys who did
not experience the famine? What will be an ideal response?
Trypanosomes are effective parasites of humans because they evade the immune system by __________.
a. colonizing the exterior, rather than the interior, of the body b. entering cells of the immune system itself c. sequentially changing surface proteins d. only spending a short period of time in the body before moving on to another host e. producing highly specialized cells that together make up an integrated, multicellular organism