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
ANSWER: a
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Pathogenicity is the ability
A) of the host to inflict damage on the pathogen. B) of the host to resist damage by the pathogen. C) of the pathogen to inflict damage on the host. D) None of these are correct.
The basswood in Figure 35-3 is __________ years old
a. 0
b. 2
c. 3
d. 4
e. 5
Tuberculosis may be diagnosed using a(n) ________ on sputum (lung fluid) samples
A) direct fluorescent antibody test B) complement fixation test C) neutralization test D) immunochromatographic assay E) viral hemagglutination test
Calories are a measure of the:
A) amount of energy the food contains. B) nutritional value of food. C) amount of minerals and vitamins a food contains. D) weight of the food.