Humans cannot survive at sea by drinking salt water. However, marine vertebrates such as sea turtles and various sea birds can survive by drinking salt water. What do they have that humans do not?
A. The ability to secrete salts and wastes into their intestinal contents like an insect
B. Salt glands
C. They use ammonia as their primary nitrogenous waste
D. Body fluid concentrations that are similar to or greater than those of seawater
E. Kidneys that are extremely good at producing a concentrated urine
Answer: B
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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.
Protein breakdown produces ____, which requires a large amount of water to flush out of the body.
A. nitrogen gas B. carbon dioxide C. ammonia D. carbon monoxide E. oxygen
Diastolic pressure is when the heart atria are relaxing.
Answer the following statement true (T) or false (F)
Lyme disease is caused by ______ transmitted by ticks.
A) Leptospira interrogans B) Rickettsia typhi C) Borrelia burgdorferi D) Proteus vulgaris E) Rickettsia rickettsii