The function of the nucleolus is
A. the assembly of ribosome components.
B. the assembly of mRNA.
C. the transport of material into and out of the nucleus.
D. protein synthesis.
E. photosynthesis.
A. the assembly of ribosome components.
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When does the synaptonemal complex disappear?
A) late prophase of meiosis I B) during fertilization or fusion of gametes C) early anaphase of meiosis I D) mid-prophase of meiosis II E) late metaphase of meiosis II
A channel that opens in response to changes in ionic charge across a membrane is called a ____
a. voltage-gated channel b. ligand-gated channel c. charge-gated channel d. electric-gated channel e. positive-gated channel
The first amino acid of a new polypeptide chain is
a. alanine. b. cysteine. c. variable. d. phenylalanine.
e. methionine.The origin of a skeletal muscle is
a. attached to the less mobile portion of the skeleton. b. attached to the portion of the skeleton that moves when the muscle contracts. c. never attached to the skeleton. d. its belly.