Which statement about SNPs in the human genome is true?
A) Most SNPs have an effect on phenotype.
B) Any two human genome copies will have on average 3 million single nucleotide polymorphisms.
C) SNPs refer only to deletions or insertions, not base substitutions.
D) Most SNPs are located in the introns of genes, and thus effect phenotype.
B) Any two human genome copies will have on average 3 million single nucleotide polymorphisms.
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When antiseptics and disinfectants are compared, antiseptics are generally
A. unpredictable in toxicity. B. equally as toxic. C. more toxic. D. less toxic.
Human cells that have completed telophase I will each contain ________ chromosomes, which will be in a(n) ________ form
A) 46; replicated B) 46; unreplicated C) 23; replicated D) 23; unreplicated
Which of the following is NOT true of cell membranes?
A. They are composed of four carbohydrate layers. B. They contain protein molecules. C. They regulate movement of some substances into and out of the cell. D. They contain phospholipids.
Chromatin that contains sequences that are not transcribed in any cell type is called
a. constitutive heterochromatin. b. facultative heterochromatin. c. constitutive euchromatin. d. facultative euchromatin.