X-linked traits are more likely to be expressed in males. Why? Under what circumstances are they expressed in females?
What will be an ideal response?
Males are hemizygous, with only one X chromosome; therefore, any genes on that chromosome are expressed, regardless of whether they are dominant or recessive. Females must be homozygous for a recessive X-linked allele to be expressed.
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DNA repair mechanisms occur
A. only in prokaryotes. B. only in eukaryotes. C. in both eukaryotes and prokaryotes. D. in neither eukaryotes or prokaryotes.
Ammonification is the conversion of ________ to NH3 and NH4.
A. living plant matter B. nitrate C. inorganic nitrogen D. nitrite E. organic nitrogen
Which of the following foods would be a good source of fiber?
A. whole-wheat bread B. bran cereal C. peaches D. peanuts E. All of these are good sources of fiber.
Which of the following is NOT a characteristic of phospholipids?
A. they are found in cellular membranes. B. they can form micelles and bilayers. C. they contain fatty acids that associate with water. D. they contain a hydrophilic phosphate "head". E. they contain two fatty acids and a phosphate functional group.