Which of the following is a major contributor to variation in gene density in eukaryotes?

A) restriction sites B) transposons
C) repetitive sequences D) heterochromatin


Answer: C

Biology & Microbiology

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Why is speciation by polyploidy more likely in plants than in animals?

A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis. B) Plant gametes lack postzygotic isolating mechanisms. C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction. D) Plants are sessile and cannot speciate via dispersal. E) Plants lack the DNA repair enzymes that animals have.

Biology & Microbiology

Cl + e- ? Cl- is an example of a:

A. polymerization. B. ionization. C. reduction. D. oxidation.

Biology & Microbiology

Explain why chloroplasts and mitochondria both have a sac-within-a-sac structure

What will be an ideal response?

Biology & Microbiology

Which of the following pairings of recombinant DNA techniques and applications does NOT match?

a. genetic modification of yeast: production of purified insulin b. gene therapy: replacing a defective gene c. PCR: making many copies of a segment of DNA d. gene silencing: production of subunit vaccines

Biology & Microbiology