The bacterium Thermus aquaticus proved to be
important in biology because
a. it put researchers on a path that led to the great
domain of life, the Archaea.
b. it makes a heat resistant enzyme.
c. its heat-resistant enzyme can catalyze the
polymerase chain reaction.
d. synthetic forms of its heat-resistant enzyme
triggered a revolution in biotechnology.
e. all of these are true.
Answer: e
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All of the following are fat-soluble vitamins found in meat EXCEPT
A) D B) B C) K D) A
Haploinsufficiency ____
a. produces Barr bodies
b. results from elevated gene dosage c. occurs when a diploid organism has only one functional copy of a gene d. occurs due to gene duplication e. refers to the loss of a whole set of chromosomes
Which part of the eye contains most of its blood vessels?
a. choroid. b. retina. c. sclera. d. choroid. e. cornea.
Which of the following statements correctly matches a body system with its function?
a) the digestive system facilitates absorption of substances into the bloodstream b) the respiratory system transports oxygenated blood throughout the lungs and body c) The excitatory system prevents harmful substances from entering the body d) The endocrine system transports hormones from place to place within the body