The monomer of tubulin:
a. Has 3 subunits in it
b. Is a monomer with a molecular weight of 42 kDa
c. Is a dimer with a molecular weight of 220 kDa
d. Is a heterodimer with a total molecular weight of 110 kDa
e. None of the above
Answer: d. Is a heterodimer with a total molecular weight of 110 kDa
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
Based on the number of species, the most successful extant phylum of plants is the
A. Anthophyta. B. Coniferophyta. C. Pterophyta. D. Gnetophyta. E. Charophyta. F. Hepaticophyta.
Foxes, cats, and rabbits have enzymes that are heat-sensitive, causing a seasonal variation in coat color due to
A. multiple alleles. B. pleiotropy. C. an environmental effect. D. incomplete dominance.
Discuss the various ways by which antibodies interact with antigen and facilitate antigen inhibition or destruction.
What will be an ideal response?