What is a codon?
A) a segment of a chromosome that encodes an RNA
B) three genes in a bacterium that are all regulated together
C) three amino acids in a row in a protein
D) a three-base sequence of mRNA that codes for a specific amino acid
E) a sequence in DNA that is the binding site for RNA polymerase
Answer: D
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Which of the following is not a major functional class of proteins?
A) trifunctional proteins B) enzymes C) motility proteins D) regulatory proteins E) structural proteins
Because glucose is a large molecule, it crosses the membrane through ____________________ diffusion. Fill in the blank(s) with the appropriate word(s)
DNA may be damaged from the by-products of normal cellular aerobic respiration. Name three of these electrophilic oxidants that are generally classified as reactive oxidants
What will be an ideal response?
Which of the following statements about how fruit flies can develop an eye in the middle of a leg is true?
(a) When the Ey gene is expressed in adult leg cells, these cells de-differentiate and become eye cells. (b) The Ey gene encodes a transcription regulator that is the only transcription regulator used to produce a fruit-fly eye. (c) When the Ey gene is introduced into cells that would normally give rise to a leg, the transcription regulators used to control its expression in the leg are different from those that are normally used to control Ey expression in the eye. (d) All the eye cells found in the adult leg are a single cell type and have identical characteristics.