A culture medium made of extracts from yeasts, meat, or plants is a ________ medium.
a) complex
b) selective
c) differential
d) chemically defined
Ans: a) complex
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You are studying reproduction in a species of frog. Say there was a mistake in meiosis such that all the gametes produced by two individuals are diploid rather than haploid. Two of these gametes fuse. This zygote is:
A. haploid. B. diploid. C. tetraploid. D. octoploid.
If nondisjunction occurs during meiosis I, ____
a. two gametes will be normal and two will be missing one chromosome b. two gametes will be normal and two will have one extra chromosome c. three gametes will be normal and one will have two extra chromosomes d. all gametes will be normal e. all gametes will be abnormal
A researcher identifies an abnormality in a protein that causes a particular inherited illness. To develop a treatment, it would be most helpful to know
A) which cells are affected and how to replace the protein's function in them. B) if this type of mutation occurs in all species. C) the other types of molecules that cause or contribute to the disease. D) how the mutation was caused.
Most changes to the universal genetic code
a. require corresponding mutations in rRNAs. b. are to allow encoding of more than twenty amino acids. c. occur in nuclear genomes. d. occur in yeast species. e. affect termination codons if in the nuclear genome.