Why don't plant cells use a contractile ring to divide their daughter cells?
A. Plant cells don't have an actin
cytoskeleton.
B. Plant cells don't form daughter cells.
C. A contractile ring can't "pinch" a cell wall.
D. Plant cells don't have plasma membranes.
C
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Consider the following two populations and the frequencies of alleles at the FGFR-1 locus. Allele 1 Allele 2 Allele 3 Allele 4 Population 1 0.25 0.25 0.25 0.25 Population 2 0.50 0.42 0.05 0.03 Which of the populations has greater genetic variation?
A. population 1 B. population 2 C. Neither; genetic diversity is the same for both populations.
While synthesizing a new blue pigment, a chemist notices that the new compound congregates between an aqueous (water) environment and a hydrophobic environment. When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment?
A) The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules. B) The pigment is hydrophilic and will not form hydrophobic bonds with the oil. C) The pigment is amphipathic, having polar and nonpolar regions. D) The pigment is neither polar nor nonpolar; it is apolar. E) The pigment is probably hydrophobic and is attempting to bond with the oil.
A plant with a very small tubular type of flower that cannot be pollinated by a large honeybee is exhibiting which
prezygotic isolating mechanism?
a. behavioralb. ecological c. gametic d. mechanical e. temporal
A condition that interferes with the ability of the small intestine to take up nutrients is
a. gastritis. b. colitis. c. a malabsorption disorder. d. diverticulitis. e. diverticulosis.