Which lineage includes living members that are sharks, skates, and rays?
a. Sarcopterygii
b. Actinopterygii
c. Petromyzontoidea
d. Chondrichthyes
Answer: d. Chondrichthyes
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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.
The ability of DNA polymerase to repair its own nucleotide mismatches is called ____________________
Fill in the blank(s) with correct word
The duration of an action potential is approximately five ____
a. microseconds b. milliseconds c. centiseconds d. seconds e. nanoseconds
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