Archaea and bacteria diverged approximately:
A) 3 billion years ago.
B) 2 billion years ago.
C) 4 billion years ago.
E) 10,000 million years ago.
Ans: C) 4 billion years ago.
You might also like to view...
Like mitochondria, the inner membranes of chloroplasts are highly convoluted so as to greatly increase surface area
A. true B. false
Geneticists construct linkage maps of chromosomes by
A) correlating a phenotype to an observable chromosomal abnormality. B) determining the number of crossovers between genes on different chromosomes. C) calculating the percent recombination between two genes on the same chromosome. D) observing the number of genes on a chromosome.
Select the best response to the question. ?Which of the following patients are at high risk for developing ?Pneumocystis jiroveci? pneumonia (PJP)?
A) a patient who has had a liver transplant B) a patient with severe lung disease C) a patient who has had a myocardial infarction ("heart attack") D) a patient who has taken several different antibiotics in the past 3 months
Restriction enzymes are
A) bacterial enzymes that splice DNA. B) bacterial enzymes that destroy phage DNA. C) animal enzymes that splice RNA. D) viral enzymes that destroy host DNA.