All plant cells are surrounded by cell walls
A. true
B. false
B
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Seth purchased five pounds of live crayfish and realized that the outer shells were made of a tough carbohydrate similar to that used to make the carapace of a cockroach. What do you think the outer shells of the crawfish are made of?
A. Glycogen B. Chitin C. Amylopectin D. Cellulose E. Fibrin
Because archaeons lack peptidoglycan in their cell walls
A. some have an outer layer of complex polysaccharide. B. they must always be grown in isotonic medium. C. some have an outer layer of protein. D. some have an outer layer of complex polysaccharide and some have an outer layer of protein.
According to the example of the genotyping microarray depicted in Figure 15.8, which one of the following genotypes will fluoresce at the most sites?
A. the homozygous C-G/C-G genotype B. the homozygous T-A/T-A genotype C. the heterozygous C-G/T-A genotype D. None of the answer options is correct; they all fluoresce at an equal number of sites. E. It is impossible to determine with the information provided.
What has caused this strange result?
A scientist has been growing a bacteria strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. A. A prophage switched from the lysogenic cycle to the lytic cyle. B. A prophage switched from the lytic cycle to the lysogenic cycle. C. The bacteria is infected with a temperate phage. D. The bacteria is infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle. E. The bacteria is infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle.