Which of the following experimental procedures is most likely to speed up mRNA degradation in a eukaryotic cell?
a. removal of one or more exons
b. lengthening of the poly-A tail
c. removal of the 5' cap
d. removal of C nucleotides
Answer: c. removal of the 5' cap
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Which description of skeletal muscle is correct?
a. Each cell contains one nucleus. b. The fibers and filaments are arranged in parallel. c. Sarcomeres work in opposite directions during contraction. d. Actin power strokes produce the contraction. e. The thin filaments are situated in the middle of each sarcomere.
When considering time and temperature as factors in microbicidal activity,
A. time is not a factor, only temperature. B. they are inversely proportional to each other. C. they are directly proportional to each other. D. they must be of equal value e.g. 30 minutes at 30°C.
Which of the following occurs as a result of meiosis?
A) Haploid nuclei with unpaired chromosomes are produced from diploid parent nuclei with paired chromosomes. B) Diploid nuclei with paired chromosomes are produced from haploid parent nuclei with unpaired chromosomes. C) Haploid nuclei with paired chromosomes are produced from diploid parent nuclei with unpaired chromosomes. D) Diploid nuclei with unpaired chromosomes are produced from haploid parent nuclei with paired chromosomes.
Which of the following is a function of a poly-A signal sequence?
A. It is a sequence that codes for the hydrolysis of the RNA polymerase. B. It adds a 7-methylguanosine cap to the 3' end of the mRNA. C. It codes for a sequence in eukaryotic transcripts that signals enzymatic cleavage ~10-35 nucleotides away. D. It allows the 3' end of the mRNA to attach to the ribosome. E. It adds the poly-A tail to the 3' end of the mRNA.