In plants, which of the following cells is(are)
diploid?
a. egg
b. sperm
c. spore
d. leaf cell
e. spore and leaf cell
Answer: d
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The renal vein sends blood back to the heart via which vein?
a. iliac vein b. gastric vein c. inferior vena cava d. superior vena cava
The adjustment of the shape of the lens by the ciliary muscle is:
a. visual accommodation b. refraction c. reflection d. photoreception e. perception
Ribosomal RNA
a. covalently binds amino acids. b. contains an anticodon. c. is produced in the nucleolus of the nucleus. d. assists in DNA replication. e. has no known function in the cell.
A nerve impulse is initiated when
A. a reversal in the polarized state of the cell causes it to reach action potential. B. voltage-gated channels close. C. physical disruption of the cell membrane causes some of its contents, including ions, to leak out. D. the Schwann cells move into their new position.