In the early years of the twentieth century, ____ proposed that some genetic disorders and abnormalities of

metabolism are related.
a. Sir Archibald Garrod
b. Francis Crick
c. Linus Pauling
d. Linda Bartoshuk
e. Gregor Mendel


a

Biology & Microbiology

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A bacterial cell containing an F factor is a threonine prototroph. Conjugation occurs with an F– threonine auxotrophic cell. The exconjugant cell can grow on medium lacking threonine. Where was the F factor in the donor cell?

A) F plasmid B) Hfr chromosome C) R plasmid D) A or B are both possible. E) A, B, or C are all possible.

Biology & Microbiology

David Jablonski and colleagues found that species of bivalves with which of the following trait(s) persisted longer, and were less likely to die out, during times of background extinction?

A) epifaunal, suspension-feeding lifestyle B) wider geographic ranges C) planktonic larval stages D) All of the above. E) None of the above.

Biology & Microbiology

Prior to mitosis and after S phase, each chromosome of a eukaryotic cell consists of a pair of identical structures called

A) chromatin. B) sister chromosomes. C) nucleoli. D) sister chromatids.

Biology & Microbiology

Which of the following mammalian traits exhibits a relatively low h2 value?

A) birth weight in cattle B) litter size in mice C) tail length in mice D) milk yield in cattle

Biology & Microbiology