The DNA in linear eukaryotic chromosomes is wrapped around proteins called _____________, which keep the DNA from getting tangled and enable an orderly, tight, and efficient packing of the DNA inside the cell.

a. histones
b. histamines
c. telomeres
d. ribosomes
e. centromeres


Ans: a. histones

Biology & Microbiology

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What is the relationship between recombination frequency and the actual physical distance on a chromosome?  

A.  As physical distance increases, the recombination frequency increases in a linear fashion. B.  As physical distance increases, the recombination frequency decreases in a linear fashion. C.  As physical distance increases, the recombination frequency first increases in a linear fashion, but gradually levels off to a frequency of 0.5. D.  As physical distance increases, the recombination frequency first increases, but then decreases.

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Histones that are tightly wound by DNA and are the basic unit of chromatin are called  

A.  operons. B.  nucleosomes. C.  protein clusters. D.  repressor genes. E.  facilitators sites.

Biology & Microbiology

Which of the following is not true about monozygotic twins?

A) They share all alleles at all loci. B) They have a genetic relatedness of 0.5. C) They have a genetic relatedness of 1.0. D) They come from the joining of a single egg with a single sperm cell. E) They are the result of a split of the zygote after fertilization.

Biology & Microbiology

ADH increases the permeability of water of the _________ in the kidney.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology