The hormones epinephrine and norepinephrine constitute the "alarm" response of the body to stress. What organ secretes these hormones?
A. Pineal gland
B. Adrenal medulla
C. Thyroid gland
D. Anterior pituitary gland
E. Pancreas
Answer: B
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Random variation in the outcomes of competition experiments is called
A. allelopathy. B. stochasticity. C. commensalism. D. competition frequency. E. resource partitioning.
The graph below shows a growth curve of E. coli growing in a defined medium containing equal molar amounts of glucose and lactose.
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Based on your knowledge of the regulation of the lac operon, the best explanation of these results is that
A) early on, due to the presence of lactose, the bacteria utilize the lac operon. Glucose is used later.
B) the bacteria are utilizing both sugars simultaneously.
C) the presence of glucose causes the formation of cAMP catabolic repressor protein (CRP) complexes, which shut down the lac operon until the glucose is used up.
D) glucose is used first. Once glucose becomes limiting, intracellular cAMP increases, forming cAMP-CRP complexes that activate the lac operon to use lactose.
E) none of the above
If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?
a. 50 b. 200 c. 75 d. 25 e. 150
Over many generations, the population of snakes should evolve toward striped snakes that flee by turning or checkered snakes that flee straight.
a. true b. false