Nucleosomes are bead-like structures ____
a. that form during interphase to assist with DNA uncoiling
b. that are a major class of proteins in chromatin
c. composed of histone wrapped with DNA
d. composed of linked homologous chromosomes
e. composed of pyrimidines and purines
c
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Let R = red pigment and r = no pigment. In carnations, RR offspring make a lot of red pigment, rr offspring make no pigment and Rr offspring make a small amount of red pigment, thus appearing pink. Pink carnations are therefore an example of
A. codominance. B. incomplete dominance. C. epistasis. D. pleiotropy.
Vitamins A, C, and E are known as ________ because they neutralize free radicals, therefore reducing the risk of cancer
Fill in the blank(s) with correct word
Which of the following phenomena produces magnification?
A) the wavelength of a radiation source B) the refraction of radiation as it passes through a lens C) the thickness of a microscopic specimen D) the numerical aperture of a lens E) the length of an objective lens
Researchers often work with temperature-sensitive mutations ________, because null alleles of these genes create mutants that cannot grow under any conditions.
A) that confer antibiotic resistance B) in essential genes C) that affect colony morphology D) that affect metabolism