In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material. The phage that were used for this experiment consisted of DNA surrounded by a protein coat. Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell. To scientifically determine whether DNA is the genetic material, Hershey and Chase made
phage in a medium containing radioactive sulfur-35 (S35). Why was S35 used in this experiment?
A. Only amino acids contain sulfur.
B. Only nucleic acids contain sulfur.
C. Both nucleic acids and amino acids contain sulfur.
D. The radioactive sulfur labels peptide bonds.
A
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Hair follicles and blood vessels are found in which layer of the skin?
a. epidermis b. dermis c. subcutaneous tissue d. stratum basale e. stratum corneum
How do the hormones involved in blood calcium homeostasis actually function?
A) Parathyroid hormone stimulates calcium deposit in bones and increases calcium uptake in the kidneys. B) A falling blood calcium level causes the thyroid to release calcitonin. C) Calcitonin acts to lower blood calcium levels, and parathyroid hormone acts to raise blood calcium. D) Both parathyroid hormone and calcitonin act to raise blood calcium levels.
The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is
A. osmosis. B. exocytosis. C. endocytosis. D. active transport. E. facilitated diffusion.
The heart rate decreases in response to the arrival of _____
A) acetylcholine B) endorphin C) nitric oxide D) gamma-aminobutyric acid (GABA)