Which of the following accurately describes an oncogene?
a. a gene that may cause cancer when it has been mutated
b. genes that trigger apoptosis in malignant cancer cells
c. carcinogenic viral DNA inserted into human DNA
d. a duplicate of a damaged gene that prevents cancer
a. a gene that may cause cancer when it has been mutated
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Cave art by early humans recognized the existence of the major signs of inflammation. The most inclusive set of symptoms of inflammation that might appear in such early human art is _____
A) heat, pain, and redness B) pain and whitening of the surrounding tissue C) swelling and pain D) antibody-producing cells E) swelling, heat, redness, and pain
In the past, species of sponges, cnidarians, and ctenophores were referred to as "lower" or "primitive" animals because of their relatively simple body plans and lack of any sophisticated organ differentiation
Which of the following suggest that the terms "lower" or "primitive" are not useful as descriptors for these organisms? A. Many members of these groups are active predators and feed on other organisms. B. These groups have been around for millions of years, so their evolutionary path has been successful in spite of limited complexity. C. These groups are not primary producers, so should not be classified as "lower" because they occur higher on the trophic pyramid. D. These groups harbor a lot of genetic variation; "lower" groups would have less evolved genomes.
Hotspot regions make up only 2 percent of the total land mass but contain what percentage of the world's endemic plant species?
A) 2 percent B) 50 percent C) 75 percent D) 90 percent
All of the following statements about catalysts are true EXCEPT
A) catalysts increase the reaction rate. B) catalysts are not permanently altered during reaction. C) catalysts increase activation energy requirements. D) biological catalysts are specific enzymes. E) catalysts can be used repeatedly.