In yeast, heterochromatin formation and transcriptional repression can be facilitated by transcripts of
a. telomeric simple sequence satellites.
b. intronic sequences.
c. histone genes.
d. centromeric simple sequence satellites.
e. nested genes.
Ans: d
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Why was it important that the pea plants Mendel chose were true-breeding?
a. These plants were resistant to mutations that would have confounded his calculations. b. True-breeding plants meant that infertile samples did not affect trait inheritance probabilities. c. Because the plants were naturally self-fertilizing, traits from other plants could be excluded. d. Scientific journals at that time would only accept results from specific, verified species
Restriction enzymes cut double-stranded DNA at a specific base sequence ____
a. between genes b. and produce fragments of four to eight base pairs in length c. between bacterial and viral DNAs d. between purines and pyrimidines e. between promoter and operator DNA sequences
When cancer cells infiltrate muscle cells under the
breast, the only treatment option is a. radiation therapy. b. chemotherapy. c. a radical mastectomy. d. gene therapy. e. diet modification with massive vitamin intake.
The stages of follicle development are:
A) ovarian follicle, mature follicle, oocyte. B) tertiary follicle, secondary follicle, primary follicle, corpus luteum. C) corpus luteum, tertiary follicle, secondary follicle, primary follicle. D) primary follicle, secondary follicle, tertiary follicle, corpus luteum.