An enzyme is
A. always a protein.
B. not necessary to sustain life in a cell.
C. All of the answer choices are correct.
D. an organic molecule that catalyzes a cellular reaction.
E. used up in a reaction.
D. an organic molecule that catalyzes a cellular reaction.
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Homologous structures are
A. structures of animals that appear to have evolved from different parts of their bodies. B. structures of animals that have different appearances and functions but seem to have evolved from the same body part in a common ancestor. C. structures of animals that have the same appearances and functions but obviously no common ancestor. D. structures of animals that have different appearances and functions but different ancestors.
The enzymatic activity of a telomerase is best described as a
A) polymerase. B) ligase. C) topoisomerase. D) reverse transcriptase. E) exonuclease.
A cat's scientific name is Felix domesticus, which genus does it belong to ?
a. Cat b. domesticus c. Felix
Genes are expressed at widely different levels in a given cell type. For the scarce mRNAs in cells, what fraction is produced in all cell types (say liver or kidney), and what is the name given to these genes?
What will be an ideal response?