Which type of genes, when abnormally activated so that protein is always present and active, can result in cancer?
A. initiator caspase genes
B. executioner caspase genes
C. proto-oncogenes
D. tumor suppressor genes
E. DNA repair protein genes
Answer: C
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Twenty-five years ago, when Oshima and colleagues discovered that a mutation in the GAL4 gene led to the inability to synthesize all five enzymes required for galactose catabolism (breakdown), they couldn't be blamed for wanting to apply a bacterial model
to explain this finding. What they expected, but did not find, was _____. A) that all five genes constitute an operon B) five widely separated genes, each containing a GAL4-binding site in its regulatory region C) that chromatin decondensation played an important role in regulating the genes of galactose catabolism D) that transcription is important in regulating the genes of galactose catabolism
Normally, only female cats have the tortoiseshell phenotype because _____
A) a male inherits only one allele of the X-linked gene controlling hair color B) the Y chromosome has a gene blocking orange coloration C) only males can have Barr bodies D) multiple crossovers on the Y chromosome prevent orange pigment production
Mimosa plants spread their leaflets during the day and fold them at night. You decide to design an experiment to test whether Mimosa's leaf movements are controlled by a biological clock. Which experiment would be the best test of your hypothesis?
A) Growing the plant indoors and turning the lights on in the middle of the night. If a biological clock is controlling leaf movement, the leaves will open. B) Putting the plant under a bright light in the middle of the day. If the leaves close, a biological clock mechanism is ruled out. C) Subjecting the plant to a flash of red light in the middle of the night. If the leaves open at the usual time the next morning, a biological clock mechanism is ruled out. D) Putting the plant in a dark closet at nightfall. Check on the plant at noon the next day, while the plant is still in the closet. If the leaves are open, a biological clock is indicated.
Choose the hormone that is not correctly matched with its chemical category.
A. Glycoprotein-luteinizing hormone B. Steroid-norepinephrine C. Amino acid derivative-melatonin D. Peptide-antidiuretic hormone