In the accompanying figure, the structure labeled as 2:
a. responds to a lack of light.
b. protects the stem tip as it moves through the soil.
c. is the first structure to emerge from the seed during germination.
d. is called the coleoptile.
e. surrounds and protects the young shoot.
b
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Which of the following is considered a reverse mutation that will restore the wild type phenotype?
A. A mutation that restores the function of a protein even though it does not restore the base sequence or the amino acid sequence to the wild type. B. True reversion back to the wild type base sequence. C. Mutation to a different base sequence, but one that restores the amino acid sequence in the protein to the wild type sequence. D. All of the choices are correct.
In a classic experiment, Otto Loewi stimulated the vagus nerve of a frog heart electrically. He let the fluid bathing the heart he was stimulating flow to and thus contact a second, nonstimulated heart. Both the first and second hearts slowed down with this stimulation. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system. B. sympathetic system. C. somatic system. D. atrioventricular system. E. central nervous system.
Sortase is a protein enzyme of bacteria that
A. directs secretion of proteins across the outer membrane. B. plays a key role in directing proteins to the periplasm. C. catalyzes covalent attachment of some surface proteins to peptidoglycan. D. functions by transporting flagellum proteins to their extracellular site of assembly.
Plants are _____. (choose all that apply)
a. organisms e. consumers b. a domain f. producers c. a species g. hypotheses d. eukaryotes h. traits