An embryo with no SRY gene develops into a
__________. Fill in the blank(s) with the appropriate word(s).
Answer: female
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Which of the following statements about "excitable membranes" is correct? (Select all correct choices.)
A. Cells spend a significant amount of energy to pump Na+ out of muscle cells at rest. B. The difference in charge across a plasma membrane is called a membrane potential. C. Acetylcholine released from a nerve cell binds to a ligand-gated ion channel at the plasma membrane of a muscle cell. D. An excitable membrane at rest has a high concentration of Cl- ions outside the cell, which flood into the cell upon the opening of an ion channel.
If another C were inserted next to the fourth base
from the left (C) in this mRNA, what would be the amino acid sequence of the resulting polypeptide? AUGCGUCCA a. leucine – glutamine – valine b. methionine – leucine – serine c. serine – threonine – STOP d. methionine – proline – serine e. none of these
Diploblastic animals, such as cnidarians and __________, have only two germ layers, ectoderm and
__________. a. sponges; ectoderm b. sponges; mesoderm c. ctenophores; mesoderm d. ctenophores; endoderm e. ctenophores; metaderm
An mRNA molecule leaves the nucleus containing the following base sequence: CAC GUA GUA CCC. Which is the correct complementary base sequence for translation?
A. CAC GUA GUA CCC B. CAC GTA GTA CCC C. GUG CAU CAU GGG D. GTG CAT CAT GGG