Cytokinins are plant hormones that usually affect cell
A. turgor pressure.
B. wall expansion.
C. elongation.
D. division.
E. growth.
Answer: D
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Supercoiling is important for DNA structure, because
A) it holds together the antiparallel strands of DNA in the double helix. B) it provides energy for transcription. C) it condenses the DNA so that it can fit inside the cell. D) it prevents RNA from pairing with DNA in the double helix.
Type II restriction endonucleases
A) are heterodimers. B) natively function to methylate specific nucleotides and prevent foreign DNA from being incorporated into the genome. C) recognize nucleotide sequences that are palindromic. D) require ATP energy to cleave dsDNA.
The respiratory pigment you would find in a blue crab or octopus is
A. hemocyanin. B. hemoglobin. C. hemophilin. D. ferritin. E. calmodulin.
The most common type of neuron in vertebrates is the _________ neuron.
A) unipolar B) multipolar C) bipolar D) semipolar