Enzymes that are expressed at a constant level all the time are said to be .
A. inducible
B. constitutive
C. attenuated
D. repressible
Answer: B
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The last common ancestor of all bilaterians is thought to have had four Hox genes. Most extant cnidarians have two Hox genes, except Nematostella (of ?-catenin fame), which has three Hox genes. On the basis of these observations, some have proposed that the ancestral cnidarians were originally bilateral and, in stages, lost Hox genes from their genomes. If true, this would mean that _____.
A) the Radiata should be a true clade B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral trait C) Hox genes play little actual role in coding for an animal's "body plan" D) the Cnidaria may someday replace porifera as the basal bilaterians B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral
A form of diffusion in which the molecules pass through a protein instead of between the phospholipids is called ________
A) facilitated diffusion B) diffusion C) osmosis D) active transport
When a cell uses fatty acids for aerobic respiration, it first hydrolyzes fats to
A) glycerol and amino acids. B) glycerol and fatty acids. C) fatty acids and sugars. D) sugars and glycerol.
Which type of plant hormone generally acts as a growth inhibitor?
A) auxins B) gibberellins C) cytokinins D) abscisic acid (ABA)