A houseplant placed in a window grows toward the source of light because auxin ____
a. becomes more concentrated on the illuminated side of the plant
b. becomes more concentrated in the roots of the plant
c. becomes more concentrated on the shady side of the plant
d. inhibits the growth of cells on the shady side, so the cells on the sunny side grow larger
e. inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster
ANSWER: c
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When acetyl-CoA containing radioactively labeled carbon atoms is fed to cells, the CO2 produced is not initially radioactive. However, molecules of citrate and oxaloacetate are radioactive. Only after some time has passed will radioactive CO2 be released. What is the best explanation for this observation?
A. Acetyl groups are not metabolized directly into CO2, but enter a cyclical metabolic pathway. B. Acetyl groups first combine with citrate and oxaloacetate before being metabolized into CO2. C. Acetyl groups are not metabolized directly into CO2, but enter a linear metabolic pathway. D. Acetyl groups are metabolized directly into CO2.
Viruses are often used as cloning hosts in recombinant DNA methods.
Answer the following statement true (T) or false (F)
Which kind of exercise makes skeletal muscles
more resistant to fatigue?
a. high intensity-short duration b. low intensity-long duration c. medium intensity-medium duration d. high intensity-long duration e. low intensity-short duration
Are genetic maps based on the actual distance on chromosomes as measured by nucleotides?
What will be an ideal response?