In a life cycle that exhibits ____, the only diploid cell is the zygote
a. alternation of generations
b. haploid-dominance
c. heterotrophism
d. endosymbiosis
e. diploid-dominance
ANSWER: b
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A(n) ________ is composed of tetrameric protofilaments.
A) extracellular matrix B) microtubule C) bacteriophage D) microfilament E) intermediate filament
Plant cells permit ions and small molecules to move between adjacent cells by means of cytoplasmic
channels in their cell walls. These channels are called
a. gap junctions. b. plasmodesmata. c. desmosomes. d. cell junctions. e. tonoplasts.
Studies have shown that in the flowering plant Arabidopsis the development of parts of a flower is
governed by
a. differential uptake of hormone signals from the leaves. b. the oxygen gradient from outside to inside of the closed flower. c. differentiation of cell types as they are formed from the apical meristem. d. the timing of cell division. e. the expression patterns of several floral organ homeotic genes.
An accumulation of cells that divide
uncontrollably is known as
a. oncogenes. b. proto-oncogenes. c. neoplasms. d. checkpoints. e. descendant tumors