Amino acids are characterized by ____
a. an amino group and a hydrogen bond
b. a carboxyl group and a hydrogen bond
c. two R groups
d. an amino group, a carboxyl group, and an R group
e. an amino group and a hydrochloric group
d
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DNA consists of two antiparallel strands of nucleotides held together by
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds.
Animal cells typically achieve cytokinesis by:
A. forming a cell plate across the middle of the cell. B. chromosome condensation. C. chromosome elongation. D. binary fission. E. forming a cleavage furrow that pinches the cell into two.
Which one of the following effects is NOT the effect of auxin?
A. Promotes growth by cell enlargement B. Promotes apical dominance C. Stimulates formation of roots on a shoot D. Stimulates division of shoot apical meristem cells E. Stimulates development of lateral buds
The syndrome known as AIDS is characterized
A. by the presence of HIV. B. as an opportunistic disease resulting from herpesvirus reactivation. C. by CTL attack on CD4 T cells. D. by one or more opportunistic diseases and the presence of HIV. E. by the presence of anti-HIV antibodies.