In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits
b. introns are spliced out and combined to form complete proteins
c. introns are spliced out and combined in the tRNA
d. exons are spliced out and the introns are combined in the mature mRNA
e. introns are spliced out and the exons are combined in the mature mRNA
e
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Microinsertions and microdeletions often result in ________ mutations
A) auxotrophic B) advantageous C) silent D) frameshift
The selective permeability of a cell membrane is due to ____
a. the hydrophobic core formed by the phospholipid tails b. the hydrophilic surface facing the cell's exterior c. glycolipids on the surface of the membrane
d. the position of cholesterol in the membrane bilayer e. the hydrophilic core formed by the phospholipid tails
The neural tube will develop into the ________
a. brain and spinal cord b. vertebral column c. somites d. legs
When the nerve impulse reaches the end of the axon, it stimulates the release of a chemical that stimulates depolarization of the next neuron in the chain. This chemical is
A. acetylcholine. B. acetylcholinesterase. C. thyroxine. D. estrogen.