Which term refers to animals that do NOT have a body cavity that separates the gut from the muscles of the body wall?
a. indeterminate
b. acoelomate
c. pseudocoelomate
d. mesenteries
Ans: b. acoelomate
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Individuals with one sickle cell allele and one normal hemoglobin allele are not affected by the malaria parasite
because of ____.
a. neutral mutations b. heterozygote advantage c. frequency-dependent selection d. disruptive selection e. stabilizing selection
Which description of chromosome replication in bacteria is accurate?
a. Bacterial chromosomes are broken into individual segments containing one or more genes, which are then replicated. b. The cell’s circular chromosome is unzipped and the strands separated before the replication process can begin. c. Replication proceeds in both directions from the origin until both strands are complete chromosome loops. d. The cell’s circular chromosome begins unzipping and replicating in one direction from the origin to the terminal.
One symptom of kidney failure can be the appearance of blood in the urine. This would indicate that which part of the kidney was damaged?
A. proximal convoluted tubule B. distal convoluted tubule C. glomerulus D. nephron E. collecting duct
E.coli synthesizing K and B in the large intestine would be an example of which type of symbiosis?
A) antagonism B) commensalism C) parasitism D) mutualism