The atmospheric gas that prevents the majority of the sun's ultraviolet radiation from penetrating to the
Earth's surface is:
a. methane.
b. ammonia.
c. oxygen.
d. ozone.
e. carbon dioxide
D
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As with people, cancer is much more common among dogs that are obese and have low
activity levels. Obesity and activity level are thus considered __________ for cancer in dogs.
a. carcinogens b. risk factors c. indicators d. oncogenes
Define and explain the importance of the blood-brain barrier
What will be an ideal response?
All of the following involve molecular biology techniques except
A. ligating DNA fragments together. B. creation of Okazaki fragments. C. using restriction enzymes to cut specific sequences of DNA. D. using a DNA polymerase to copy DNA via PCR.
What is the advantage of paired appendages?
A) They increase the metabolic rate, making animals endothermic. B) They improve the sensory ability. C) They improve mobility. D) They protect the nerve cord. E) They provide internal support for the animal.