Provide an overview of the structure of Z-DNA
What will be an ideal response?
left-handed helix with two antiparallel complementary strands, 1.8 nm in diameter, 12 bases per turn, zigzag configuration, and shallow major groove
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Decomposers
A. break down dead organic matter in the environment by secreting digestive enzymes. B. break down living organic matter by secreting digestive enzymes. C. destroy living cells and then break them down with digestive enzymes. D. live in close association with another species.
Which of the following terms is NOT related to the other four?
a. amino acids b. nucleotides c. 5-carbon sugars d. phosphate groups e. nitrogen-containing bases
Which of the following defines the essential gene set of an organism such as a species of yeast?
A) genes that, when mutated, reduce the growth of a heterozygous organism B) genes whose deletion alleles are not found among haploid offspring C) the fewest genes that, when mutated, result in slow growth in optimal environments D) genes whose mutations result in haploinsufficiency E) genes that, when mutated, are either lethal or conditionally lethal in special environments
All stages of Ixodes, the vector for Lyme disease, may feed on humans
Indicate whether the statement is true or false