Bacteria transformed with plasmids are plated on growth medium containing ampicillin and X-gal. White colonies on
the plate contain bacteria with a ____ plasmid, meaning the lacZ+ gene is ____.
a. recombinant; deleted from the plasmid
b. nonrecombinant; intact
c. recombinant; intact
d. nonrecombinant; disrupted by the inserted DNA fragment
e. recombinant; disrupted by the inserted DNA fragment
ANSWER: e
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This is formed when an atom loses an electron to another atom.
A. polar covalent bond B. cations and anions that can form ionic bonds C. covalent bond D. hydrogen bond E. nonpolar covalent bond
The bacterial species that can be described as oxidase-positive, glucose-positive, maltose-positive, sucrose-negative, lactose-negative, and a major cause of bacterial meningitis is:
a. N. meningitidis. b. N. lactamica. c. Neisseria flavescens. d. N. gonorrhoeae.
The erectile tissue in the penis includes the:a
prepuce. b. mons pubis. c. cavernous bodies. d. seminal vesicles. e. vas deferens.
During the late 1800s, cattle egrets arrived in South America from Africa and began to colonize. Their range has expanded dramatically over the years. Why were they able to do this?
A. There were abundant cattle for the birds to gather around in South America; furthermore, various animals that the egrets had lived around in Africa had become quite scarce because of overhunting and poaching, causing the birds to extend their range. B. The habitats that they left in Africa were not suitable for any further colonization; thus, they were forced to emigrate. C. The food resources in South America were far superior to those in Africa, allowing the egrets more opportunity to grow and reproduce and ultimately expand their range. D. The habitats that they encountered in South America were suitable to them and unoccupied.