The disease multiple sclerosis causes myelin degeneration in vertebrate nervous systems. Knowing
this, what symptoms/effects might you NOT expect in a person with multiple sclerosis?
a. slowed action potential transmission
b. tissue numbness
c. muscular weakness
d. faulty coordination of movements
e. memory loss
E
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What molecular mechanism/feature does site-directed mutagenesis exploit to introduce a mutation at a specific site?
A) flanking complementary bound nucleotides permit non-complementary base pairing B) methylated nucleotides disrupt DNA polymerase's proofreading C) nucleotide substitution when one is depleted D) transposase-induced base pair changes
After microRNAs are transcribed, processed, and folded into stem-and-loop hairpin structures, specialized enzymes cleave the miRNAs to double-stranded fragments that are typically around 20-25 nucleotides long
A. true B. false
The usual cause of genital herpes is
A. herpes simplex virus type 1. B. herpes simplex virus type 2. C. herpes simplex virus type 3. D. herpes simplex virus type 4.
The mass extinction at the end of the Cretaceous period:a
occurred about 250 million years ago. b. had little impact on gymnosperms. c. was likely the result of dramatic climate changes. d. was followed by the period dominated by reptiles and dinosaurs. e. was caused by the global distribution of iridium and the subsequent radioactive fallout.