Most chemicals that cause cancer also induce mutations.
A) True
B) False
A) True
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Injury to what region of the vertebral column is usually most threatening?
A) cervical B) sacral C) thoracic D) coccygeal E) lumbar
Which of the following is(are) true about the DNA of a zebrafish that glows in the dark
because its DNA contains and expresses the firefly gene for bioluminescence?
a. It has recombinant DNA. b. Its DNA has mutated. c. It has evolved. d. The DNA contains a bacterial plasmid.
In female mammals,
A) the maternally inherited X chromosome is shut off in every cell. B) the paternally inherited X chromosome is shut off in some cells. C) one X chromosome is shut off in a germline cell. D) both SRY genes are activated.
Which of the following statements about the human respiratory system is false?
a) When we breathe in, air travels from the pharynx to the trachea. b) The bronchioles branch into bronchi. c) Alveolar ducts connect to alveolar sacs. d) Gas exchange between the lungs and blood takes place in the alveolus.