Within the stem of a vascular plant, where would you expect to find the cells that are the most mature?
A. within the shoot apical meristem at the tip
of the stem
B. within the zone of elongation directly
beneath the shoot apical meristem
C. at the base of the stem near the soil
C
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The epithelial cells in the skin of an animal have 24 chromosomes. How many chromosomes are present in the gametes of this animal?
A. 6 B. 12 C. 24 D. 48
Estradiol is a potent stimulator of vitellogenesis (yolk production) in egg-laying vertebrates. Increasing evidence suggests that many pollutants, for instance those derived from pulp mills, may mimic the actions of estradiol. If one were to place a sexually immature fish in water containing pulp mill effluents, what might you expect would occur?
A. The rate of vitellogenesis would decline. B. The rate of vitellogenesis would increase. C. The fish might reach sexual maturity sooner. D. The rate of vitellogenesis would decline and the fish might reach sexual maturity sooner. E. The rate of vitellogenesis would increase and the fish might reach sexual maturity sooner.
What structures are used for direct cell to cell signaling?
Desmosomes Tight junctions Exocytosis vesicles Gap junctions
WHAT IS AN EXAMPLE OF BEING HOMOLOGOUS?
What will be an ideal response?