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
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Indicate whether the statement is true or false.
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
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?
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.