What is thought to be responsible for the worldwide deaths of corals and their endosymbiotic algae?
a. ocean acidification
b. nitrogen fixation
c. soil runoff
d. declining primary productivity
e. depletion of oxygen in the oceans
ANSWER: a
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An Hfr strain is produced when
A. an F episome integrates into the E. coli chormosome B. an F episome leaves the E. coli chromosome. C. an F episome is transferred to a new cell. D. an F episome leaves the host chromosome and removes some of the host chromosome.
A human gene is composed of numerous fragments of protein-encoding information known as ________.
A. DNA B. exons C. introns D. mRNA
What do genetic map units represent?
a. relative positions of genes with respect to each other b. the chromosome on which a given gene is located c. the actual DNA sequence of a gene d. absolute physical distances between genes
DNA strands are parallel, running in the same orientation.
a. true b. false