Avery, MacLeod, and McCarty's experiments built on the results of the experiments of
A) Gregor Mendel.
B) Frederick Griffith.
C) Alfred Hershey and Martha Chase.
D) Erwin Chargaff and Phoebus Levene.
B) Frederick Griffith.
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A mass of chewed food held together with saliva is called a bolus.
a. true b. false
An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides
A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) species had little to no need to regulate blood pressure
A 25-year-old woman is seen on an emergency basis while in shock, with generalized flushing of the skin and mucous membranes. A tampon is present in her vagina. Toxic shock syndrome is suspected. Which of the following mechanisms is responsible for the toxic shock syndrome?
A. Inhibition of acetylcholine release B. ADP ribosylation of ribosomal protein C. Stimulation of G protein D. Cross-linking of MHC II and TCR proteins E. Activation of adenylate cyclase
There is a large amount of scientific evidence to support the notion that nutritional ergogenic aids will promote an improvement in physical fitness.
a. true b. false