Excellent examples of allopatric speciation can be seen:a
on islands.
b. in large lakes.
c. on the prairie.
d. in the ocean.
e. in the trees.
A
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The water vascular system in echinoderms is used for locomotion, water enters the water vascular
system of a sea star through a structure called the
a. ampulla. b. ossicle. c. radial canal. d. ring canal. e. madreporite.
White fruit color in summer squash is influenced by a dominant allele W, whereas colored fruit must be ww. In the
presence of ww, a dominant gene G results in yellow fruit, and homozygous gg results in green fruit. Give the F2 phenotypic ratios resulting from a cross of a true-breeding plant with white fruit (genotype WW GG) with a plant with green fruit. What will be an ideal response?
The enzyme carbonic anhydrase catalyzes the formation of carbonic acid from carbon dioxide and water. Imagine that you have two sealed tubes with carbon dioxide gas above a buffer containing water and carbon dioxide
One tube has carbonic anhydrase and the other does not. After 24 hours, both tubes are at equilibrium. Which statement below accurately describes the conditions in the tubes? A) The tube with carbonic anhydrase will have a lower concentration of carbon dioxide and a higher concentration of carbonic acid than the tube with any enzyme. B) The tube with carbonic anhydrase will have a higher concentration of carbon dioxide and a lower concentration of carbonic acid than the tube with any enzyme. C) The tubes will have equal concentrations of carbon dioxide and carbonic acid. D) The tube with carbonic anhydrase will have a higher concentration of carbonic acid than the tube with any enzyme, but the concentration of carbon dioxide will be the same in both tubes. E) It is not possible to determine the relative concentrations of the products and reactants without more information about carbonic anhydrase, such as the Km. What will be an ideal response?
Bacteria of the genus Mycoplasma lack cell walls. What sort of environment do they require for survival?
A) low temperature B) hypotonic C) isotonic D) hypertonic E) a biofilm