Urey and Miller's experimental setup was able to produce all twenty of the amino acids found in proteins. Some amino acids contain the element oxygen. What starting material in the Urey-Miller experiment was source of this element?
a) methane
b) ammonia
c) hydrogen gas
d) water
e) electrical sparks
Ans: d) water
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Choose the one most appropriate response for each. Some letters may not be used.
A. B. Lorenz C. Instinctive behavior D. E. Learning F. Operant conditioning G. Lek H. Imprinting I. Altruism
If the slope of the relationship between the phenotype and fitness is positive, natural selection would decrease the phenotype over generations.
a. true b. false
The principle of disinfection to reduce HAIs (healthcare associated infections) among patients was initially introduced by
A) L. Pasteur and R. Koch. B) I. Semmelweis and J. Lister. C) P. Erhlich and A. Fleming. D) J. Snow and R. Koch. E) E. Jenner and L. Pasteur.
Adaptive immunity is sometimes also called acquired immunity. Which of the following statements provides a basis for the alternative name?
A) Lymphocytes of the adaptive immune system are highly specific for a single epitope. B) Activated lymphocytes produce daughter cells that are identical in specificity and function. C) To become activated, lymphocytes require exposure to the epitope for which they are specific. D) Activated lymphocytes may persist for years in the body. E) Lymphocytes reactive to normal body components are removed.