The size of the mouse (M. musculus) genome is 2700 megabases (Mb) and it contains about 25,000 genes arranged on 40 chromosomes. If the genes are evenly distributed on chromosomes in the mouse, what is the average number of genes per chromosome?
A) 1
B) 9.3
C) 67.5
D) 625
D) 625
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Huntington's disease is caused by a single dominant allele. It is a lethal disease, yet it persists in the human population. Which of the following statements best describes why?
A. Huntington's disease is sex-linked and every human has at least one X chromosome; thus, the chances are extremely high for this allele to be maintained in the human population. B. Huntington's disease can present symptoms so mild that they appear to lack dominant expression of the allele in some individuals; in those cases, the allele is passed on to the offspring. C. While lethal to a parent, Huntington's disease will not be lethal to the offspring since it can skip a generation. D. Huntington's disease presents symptoms in mid-life, after most people have already had offspring. E. Even though Huntington's disease is lethal, it improves chances for reproduction before the person dies.
The two kinds of bone tissue are
(a) compact and loose. (b) compact and spongy. (c) dense and spongy. (d) loose and dense.
One way N. gonorrhoeae became resistant to penicillin was by acquiring a plasmid that carries the penr penicillin resistance gene, which encodes a protein that
A) allows cells to synthesize penicillin. B) cleaves penicillin to an inactive form. C) pumps penicillin out of the cell. D) attaches penicillin to the cell wall.
Which of the following is false about animals?
a. they are multicellular. b. they are heterotrophic. c. they are autotrophs. d. they lack cell walls. e. most can actively move.