The production of gene families, such as the globin genes is the result of ________
A. inversions
B. deficiencies
C. gene duplications
D. simple translocations
E. None of the answers are correct
C
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One of the earliest antimicrobials isolated from a bacterium was
A. penicillin. B. ampicillin. C. Salvarsan. D. streptomycin.
African sleeping sickness is fatal if not treated because the parasite
A) evades destruction by the immune system by changing surface antigens. B) produces a toxin which binds irreversibly to neurons. C) is an intracellular parasite in RBC's, where they are not detected by the immune system. D) reproduces so fast there is no time for an immune response to develop. E) produces a non-immunogenic toxin the immune system cannot neutralize.
Which of the following is NOT a characteristic of saturated fats?
A. they are usually solid at room temperature. B. they contain at least one double bond. C. they are found in animals. D. their fatty acids pack tightly together. E. they are a form of stored energy.
Why does a protein not function after it has been denatured?
A. The R groups form additional bonds causing the structure to become more compact. B. The normal peptide bonds are ruptured and the individual amino acids are not held together any more. C. The normal bonding between the beta sheets has been disturbed and the protein loses its normal shape. D. The normal bonding between the hydrogens in the alpha helix has been disturbed and the protein loses its normal shape. E. The normal bonding between the R groups has been disturbed and the protein loses its normal shape.