Which of the following statements about mobile genetic elements is true?
(a) Mobile genetic elements can sometimes rearrange the DNA sequences of the genome in which they are embedded by accidentally excising neighboring chromosomal regions and reinserting these sequences into different places within the genome.
(b) DNA-only transposons do not code for proteins but instead rely on transposases found in cells that are infected by viruses.
(c) The two major families of transposable sequences found in the human genome are DNA-only transposons that move by replicative transposition.
(d) During cut-and-paste transposition, the donor DNA will no longer have the mobile genetic element embedded in its sequence when transposition is complete.
(d)
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Indicate whether the statement is true or false.
The sinoatrial node consists of modified _______ tissue.
A. nervous B. muscular C. epithelial D. connective E. adipose
What is one reason why tumor-suppressor genes make poor druggable targets?
A) Cancer-causing mutations in tumor-suppressor genes result in loss of function. B) Mutant alleles of tumor-suppressor genes generally result in a greater activity of the protein, which makes inhibiting the proteins more difficult. C) Most drugs cannot distinguish the normal and mutant forms of the tumor suppressor proteins. D) Drugs that can target-tumor suppressor proteins are difficult to deliver to cancer cells.
The maximum amount of air that can be taken into
the lungs in a single deep breath is the a. vital capacity. b. tidal volume. c. total lung capacity. d. alveolar volume. e. inspirational capacity.