All of the following are common functional groups found in biological molecules except
A) phosphate groups.
B) carbonyl groups.
C) amino groups.
D) sulfhydryl groups.
E) butyl groups.
Answer: E
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A trait with variable expressivity is one that:
A. is only expressed in homozygous recessive individuals. B. is only expressed in homozygous dominant individuals. C. is only expressed in some of the individuals that have the genotype for that trait. D. is expressed in only some offspring of affected individuals. E. can be expressed differently in different individuals that have the genotype for that trait.
Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. Presuming no linkage between the genes, what should be the phenotype ratio of the offspring produced by a testcross (RrTt ? rrtt)?
a. 1 red-eyed with thumbs: 1 yellow-eyed without thumbs b. 3 red-eyed with thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs: 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thum
If the quantities of the four bases in a DNA molecule are measured, we find that
A) T = A and C = G. B) A = G and C = T. C) A = C and G = T. D) no two bases are equal in amount. E) all bases are equal in amount.
The structural difference between saturated and unsaturated fats causes what type of change at room temperature?
A. The double bonds require higher temperatures at room temperature to make this fatty acid into a liquid. B. A linear structure causes a loose forming macromolecule that is liquid at room temperature. C. Double bonds in saturated fatty acids cause a solid structure at room temperature. D. Linear structure of a fatty acid causes solid formation at room temperature.