Which lineage includes living members that are sharks, skates, and rays?

a. Sarcopterygii
b. Actinopterygii
c. Petromyzontoidea
d. Chondrichthyes


Answer: d. Chondrichthyes

Biology & Microbiology

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The binding of tryptophan to the Trp repressor protein results in:

A. the dissociation of the repressor from the operator sequence. B. a conformational change in the repressor that allows the repressor to bind the operator. C. the recruitment of RNA polymerase. D. an increase in the expression of tryptophan biosynthetic enzymes.

Biology & Microbiology

The ability of DNA polymerase to repair its own nucleotide mismatches is called ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

The duration of an action potential is approximately five ____

a. microseconds b. milliseconds c. centiseconds d. seconds e. nanoseconds

Biology & Microbiology

Which group of microbes prefers using oxygen but can survive without it?

A) aerotolerant anaerobe B) obligate aerobe C) facultative anaerobe D) obligate anaerobe E) microaerophile

Biology & Microbiology