What is the likely consequence of a mutation that alters the branch point within an intron?
A. failure of snRNAs to combine with protein and form snRNPs
B. no exon shuffling
C. no effect, since introns are not expressed
D. failure to form a lariat
E. failure of snRNPs to recognize the 5' end of intron
Answer: D
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The fat-soluble vitamins include _____
A) vitamin A B) vitamin B12 C) vitamin C D) iodine E) calcium
When a neuron is at rest, ____
a. the sodium and potassium gated channels are closed b. the sodium gated channels are closed and the potassium gated channels are open c. the sodium gated channels are open and the potassium gated channels are closed d. the sodium and potassium gated channels are open e. the sodium and potassium gated channels may be open or closed depending upon their location in the nervous system
What effect will increased blood levels of ADH have on blood volume?
A) It will decrease blood volume. B) It will have no effect on blood volume because ADH affects only urine output. C) It will increase blood volume. D) Only the plasma (fluid) part of the blood will decrease.
The enzyme packet on the head of a sperm that allows penetration into the egg is called the
a) centriole b) centromere c) acrosome d) prothallus e) penile penetrating enzyme