Which of the following is not a characteristic of a riboswitch?
A. They are structures that can form in the 5' untranslated region of some mRNA molecules.
B. They exert gene expression control only at the level of translation.
C. They may physically bind to small-molecule metabolites.
D. Ligand-binding to a riboswitch may sequester the Shine-Dalgarno sequence.
B
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Organisms that rely on the consumption of preexisting organic molecules for life are called
A. autotrophs. B. animorphs. C. plants. D. heterotrophs. E. None of the answer choices is correct.
The study of comparative embryology reveals
the conservative nature of the genes responsible for a. food procurement. b. reproductive behavior. c. embryonic development. d. embryonic size. e. embryonic intelligence
Which of the following statements apply to freshwater fish?
A) They lose water by osmosis. B) The concentration of solutes in their internal fluids is lower than in the surrounding water. C) They pump out ions via the gills. D) They produce dilute urine.
Many people with Marfan syndrome have limbs, fingers, and toes that are disproportionately long in relation to the rest of the body. However, it is the weakened heart valves and damage to the major blood vessels that are often deadly. Which tissue type is weakened with people with this syndrome?