The function of a helix-turn-helix motif in a transcription factor is to
A) recruit RNA polymerase.
B) form dimers with other transcription factors.
C) bind a specific sequence in the major groove of DNA.
D) unwind the double helix.
C) bind a specific sequence in the major groove of DNA.
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The purpose of the distasteful odor emitted from the stinkhorn fern is to
a. attract flies. b. discourage predators. c. mimic another fungus. d. prevent plants from growing nearby.
Which ecological role is least likely to be performed by bryophytes?
a. enhancing the water-holding capacity of garden soil
b. stabilizing soil surfaces with a biological crust in harsh places c. supplying a food source for animals in the arctic tundra d. providing pollination services for agricultural crops e. helping to build soil on bare rock
What does DNA sequencing suggest about the relationship between the nuclear and organellar genomes?
A) The same subset of mitochondrial genes has moved to the nuclear genome in all species. B) Mitochondrial genes that are found in the nuclear genome do not have introns, suggesting that movement occurred via an RNA intermediate. C) The mitochondrial and nuclear genomes are entirely independent of each other. D) Some cells have two types of mitochondria that have different genome sequences. E) Some proteins found in mitochondria are imported from the cytoplasm.
Which is a monosaccharide?
a. glucose b. chitin c. amylose d. starch e. glycogen