Which are the thinnest blood vessels?

A. Capillaries
B. Arterioles
C. Venules
D. Bronchioles


Answer: A

Biology & Microbiology

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In sexually reproducing species, genetic variations are not passed onto offspring via ____

a. mutation b. crossing over c. independent assortment d. fertilization e. mitosis

Biology & Microbiology

If a spontaneous mutation introduced a new allele into a population's gene pool at a chromosomal locus that had previously been static, which of the following would experience the largest change in value as a result?

(A) Average number of gene loci per chromosome (B) Average frequency of heterozygosity in the gene pool (C) Nucleotide base-pairing variability at the site of the wobble effect in codon-anticodon recognition (D) Geographic variability

Biology & Microbiology

For the process of diffusion to occur, molecules must

A. move from areas of low concentration to areas of higher concentration until an equilibrium is reached. B. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached. C. remain stationary until their molecular motion allows for an equilibrium to be reached. D. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport. E. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium.

Biology & Microbiology

Aerobic bacteria in the genus ________ are metabolically diverse soil-dwellers which also cause opportunistic disease in cystic fibrosis patients.

A. Burkholderia B. Coxiella  C. Enterobacter D. Prevotella E. Hafnia

Biology & Microbiology