The basic structural polysaccharide of fungal cell walls, crab shells, and insect exoskeletons is
a. cellulose.
b. chitin.
c. collagen.
d. hemicellulose.
Ans: b. chitin.
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Heterospory refers to having
a. male and female gametes. b. two spore types. c. both male and female parts on the same plant. d. separate male and female plants. e. both sporophyte and gametophyte generations.
In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously
Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signaling? A) Growth factor ligands do not bind as efficiently to receptors. B) Hormone concentrations decrease. C) cAMP levels change very frequently. D) Enzymatic activity declines.
If organisms A, B, and C belong to the same class but to different orders and if organisms C, D, and E belong to the same order but to different families, which of the following pairs of organisms would be expected to show the greatest degree of structural homology?
A) A and D B) B and D C) B and C D) D and E
The chromosomes line up in the middle of the cell during
A) prophase. B) anaphase. C) metaphase. D) telophase. E) prophase II.