Species richness refers specifically to
a. the numbers of individuals of each species
present.
b. the ability of larger animals to enrich
themselves by successfully preying on
smaller ones.
c. the number of different species in the
habitat.
d. the feeding levels at which the animals are
located.
e. none of these.
C
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Which gene would most likely be found in the genomes of all present-day organisms?
a. an amino-acyl tRNA synthetase gene b. a photosynthetic gene c. a nitrogen fixation gene d. a gene for anaerobic respiration e. a gene for cellulose breakdown
You would like to induce a transversion mutation into a sequence of DNA. Which type of chemical mutagen would give you the best chance of inducing the correct mutation without causing transition mutations as well?
A) base analog B) deaminating agent C) oxidative agent D) alkylating agent E) intercalating agent
Making and breaking molecules in the body require the aid of ________ to help the reactions proceed.
A. blood B. heat C. enzymes D. water
The major significance of Robert Koch's work is that
A) microorganisms are present in a diseased animal. B) diseases can be transmitted from one animal to another. C) microorganisms can be cultured. D) microorganisms cause disease. E) microorganisms are the result of disease.