Which statement BEST describes the role and importance of mobile genetic elements in genomes?
A) Mobile genetic elements almost always have either neutral or deleterious consequences for their host.
B) Mobile genetic elements are largely beneficial to hosts because they introduce new phenotypic variation into a population via transposition and/or duplication of important genes.
C) Mobile genetic elements can have deleterious, neutral, OR beneficial consequences for the host organism, and all three kinds of outcomes are common.
D) Mobile genetic elements are especially important for plant genomes such as the tomato, but they are not present in most animal genomes.
A
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Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.
Which of the following statements is true of
foraminiferans?
a. Most foraminiferans live on the sea floor. b. Foraminiferans are single-celled predators. c. The planktonic foraminiferans often have photosynthetic protists living in their cytoplasm. d. Foraminiferans secrete a shell containing calcium carbonate. e. All of these are true of foraminiferans.
If one strand of DNA is CGGTAC, then the complementary strand would be
A) GCCTAG. B) GCCAUC. C) TAACGT. D) GCCATG.
Cell walls can be found as part of:
A) bacterial cells. B) protists and animal cells. C) plant cells, bacteria, fungi, and protists. D) animal cells, fungi, and protists. E) plant cells.