A couple have a child with Tay-Sachs disease
What is (are) their genotype(s)?
a. both are heterozygous
b. one is homozgous dominant and the other is
homozgous recessive
c. both are homozygous dominant
d. both are homozygous recessive
e. more than one of these is possible
A
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The main evolutionary advantage of sexual over asexual reproduction is that it produces _____
a. more offspring per individual. b. more variation among offspring. c. identical offspring. d. offspring in a method that requires less energy from the parents. e. more specialized offspring.
Why might these species be the first to recover?
a. Grasses were not eliminated by the fire, prairie dogs and antelope have mobility. b. Grasses have a short generation time, as do prairie dogs and antelope. c. Grass reproduction is stimulated by fire, and prairie dogs and antelope both feed on grasses. d. None of the above.
What is the main purpose of a DNA probe?
A) cuts DNA targets B) hybridizes to a target sequence C) extend the growing polynucleotide D) binds to proteins
Keratins, neurofilaments, and vimentins are all categories of intermediate filaments. Which of the following properties is not true of these types of intermediate filaments?
(a) They strengthen cells against mechanical stress. (b) Dimers associate by noncovalent bonding to form a tetramer. (c) They are found in the cytoplasm. (d) Phosphorylation causes disassembly during every mitotic cycle.