In the first step of signal transduction, what is the trigger for the cellular response?

a. target protein
b. kinase
c. ligand
d. second messenger
e. effector


ANSWER: c

Biology & Microbiology

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The rate of catalysis is proportional to the concentration of the enzyme

Indicate whether the statement is true or false.

Biology & Microbiology

To which of the following groups does the

organism in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. none of the above

Biology & Microbiology

A mutation in a gene that changes a codon to one that codes for the same amino acid as the original codon; The amino acid sequence of the resulting polypeptide is thus unchanged

What will be an ideal response?

Biology & Microbiology

Which of the following statements is true about micro-RNAs?

A) They are too small to be of any use to the cell. B) They bring amino acids to the ribosome. C) They regulate the amount of protein in a cell by interfering with mRNAs. D) Alternative splicing converts them into mRNAs.

Biology & Microbiology