The primary reason that Earth experiences seasons is because of the:a
Earth's rotation.
b. Earth's orbit.
c. Earth's tilt on its axis.
d. unequal thickness of the Earth's atmosphere.
e. different layers of the Earth's atmosphere.
C
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Which of the following are examples of biotechnology applications for site-specific recombination?
A. replacement of one gene allele for another on the chromosome B. deletion of a gene from the chromosome C. alteration of the linear structure of a chromosome D. insertion of a new gene into a defined location on the chromosome E. All of the choices given are correct.
Which pairing is incorrect?
A. A:T B. G:C C. A:U D. A:G
Soon after the introduction of antibiotics, resistant strains of bacteria that could grow in the presence of particular antibiotics began to evolve. Researchers develop new antibiotics, only to see resistant bacterial strains evolve within a few years. Which of the following explains why resistant strains of bacteria can evolve so quickly?
A. Bacteria have a short generation time. B. Bacteria can transfer plasmids containing resistance genes via conjugation. C. Horizontal gene transfer. D. Bacteria have a short generation time and can transfer plasmids containing resistance genes via conjugation. E. Bacteria have a short generation time and can transfer plasmids containing resistance genes by horizontal gene transfer mechanisms such as conjugation.
An interaction between two species in which both
species benefit is a. mutualism. b. parasitism. c. commensalism. d. competition. e. predation.