For an individual with the XXY chromosomal composition, the expected number of Barr bodies in interphase cells is ________
A) variable B) zero C) one D) two E) three
Answer: C
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Which of the following statements is not true of early plant evolution, as we have learned from Rhynie cherts?
A. Early vascular plants were small, up to 15 cm tall. B. Early vascular plants branched repeatedly and contained sporangia at their tips. C. The stems of early vascular plants lacked a cuticle or stomata. D. Some of the early plants have a branched sporophyte, but no evidence of vascular tissue. E. Fossils indicate that the roots and leaves of lycophytes evolved independently from those of ferns, horsetails, and seed plants.
A number of mechanisms operate to maintain genetic diversity in a population. Why is such diversity favored?
A) Greater genetic diversity increases the chances of haploidy. B) Genetic diversity helps populations avoid diploidy. C) Genetic diversity may better adapt a population to inevitable changes in the environment. D) Diversity leads to inbreeding advantages. E) Homozygosity is an evolutionary advantage.
What is one of the roles of the APC/C during anaphase?
A. to directly target the mitotic cyclins for destruction B. to directly target separase for destruction C. to directly target cohesin for destruction D. to directly target microtubules for destruction
When cells are in an isotonic solution, they _______ water
Fill in the blank(s) with the appropriate word(s).