Which is the most frequently chosen prokaryotic host for use in cloning techniques?

A. Bacillus subtilis
B. Escherichia coli
C. Saccharomyces cerevisiae
D. Staphylococcus aureus


Answer: B

Biology & Microbiology

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Plants lose several hundred H2O molecules for each CO2 that is fixed by photosynthesis because __________________. (Select all correct answer options.)

A. the diffusion gradient is many times larger for H2O than CO2 B. H2O molecules are lighter than CO2 molecules C. H2O molecules are consumed during photosynthesis D. the diffusive pathway for H2O and CO2 is the same

Biology & Microbiology

This arthropod has four pairs of walking legs,

no antennae, and is venomous. This arthropod is ___.

a. a scorpion b. a tick c. a barnacle d. a bee e. more than one of these

Biology & Microbiology

Which factor increases the likelihood of population extinction? 

A. large population size B. isolation of a population from density-independent effects C. isolation of a population from sources of immigrants D. high resource availability E. high genetic diversity

Biology & Microbiology

Which of the following pairs of protists and their characteristics is mismatched?

A) apicomplexans — internal parasites B) euglenozoans — unicellular flagellates C) ciliates — red tide organisms D) entamoebas — ingestive heterotrophs

Biology & Microbiology