Chlorhexidine
A. is a member of the biguanides.
B. is extensively used in antiseptics.
C. is ineffective against vegetative bacteria.
D. is limited in use due to its high toxicity.
E. is a member of the biguanides AND is extensively used in antiseptics.
E
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Which embryonic cell layer develops into the lining of the gut in most eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
In the common daisy, genes A and B control flower color. Both genes have a dominant allele (A or B) and a recessive allele (a or b). At least one copy of each dominant allele is required for flowers to be colorful instead of white. Predict the genotypes and phenotypes of the F1 progeny of a cross between two white-flowered plants, one homozygous for A and the other homozygous for B.
A) AA bb, white B) aa BB, white C) Aa Bb, colorful D) Aa Bb, white E) aa bb, colorful
Genetically modified organisms include ________.
A. plants B. bacteria C. nonhuman animals D. viruses E. All of the above have been genetically modified.
Transplacental infection occurs when microbes from the mother enter fetal circulation through the umbilical artery
a. true b. false