Primary growth (lengthening) arises from ____________________. Fill in the blank(s) with the appropriate word(s)
ANSWER: apical meristems
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The process of recombination may rarely occur during mitosis
Indicate whether the statement is true or false
Of the following, which is the oldest event?
a. origin of fungi b. appearance of land tetrapods c. formation of Pangea d. age of dinosaurs e. appearance of whales
In contrast to the excretory system of annelids, the excretory system of insects:a
has many openings on the body wall. b. contains flame cells. c. is not connected to the gut. d. excretes uric acid from the rectum. e. relies on diffusion across the body wall.
Which of the following statements about plant cell walls is false?
A) Plant cell walls consist of cellulose fibers embedded in a matrix of polysaccharides and proteins. B) Plant cell walls are multilayered structures. C) Plant cell walls protect plant cells by forming an impermeable layer around the cell. D) Wood is primarily composed of plant cell walls.