In which of the following ways are archaeans

similar to eukaryotic cells?
a. size
b. shape
c. presence of histones
d. DNA polymerases
e. presence of operons


C

Biology & Microbiology

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Reinforcement is most likely to drive the evolution of 

A. prezygotic isolating mechanisms, because selection favors alleles that prevent hybridization. B. postzygotic isolating mechanisms, because selection acts after the formation of hybrids. C. prezygotic isolating mechanisms, because selection favors alleles that promote hybridization. D. postzygotic isolating mechanisms, because hybrids have low fitness relative to the parents.  

Biology & Microbiology

Which statement is NOT true about

Monteverde Cloud Forest Reserve? a. It was purchased by a private individual. b. It is one of the few habitats left for jaguarand ocelot. c. It is home to more than 400 species of birds. d. There are only a few mammalian species still surviving in the Reserve. e. Ecotourism on the reserve provides employment to local people

Biology & Microbiology

Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship.

A. 2 ? 4 ? 3 ? 1 B. 2 ? 4 ? 1 ? 3 C. 4 ? 1 ? 2 ? 3 D. 4 ? 2 ? 1 ? 3 E. 4 ? 2 ? 3 ? 1

Biology & Microbiology

Which fungal group includes organisms used for the manufacture of anesthetics, birth control agents, industrial alcohols, meat tenderizers, and yellow food coloring?

A. Zygomycetes B. Ascomycetes C. Basidiomycetes D. Microsporidia E. Glomerulomycetes

Biology & Microbiology