Answer the following statements true (T) or false (F)
1. Bacterial cells only contain one copy of its circular chromosome.
2. Bacteria can exchange DNA between strains of the same species and between different species.
3. Viroids have a genome but do not translate any of it to protein.
4. Horizontal gene transfer occurs when one species of bacteria takes up the DNA of another species that released the DNA when it died.
5. Bacterial conjugation is also called bacterial sex because there is an equal exchange of genetic information between two cells.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. FALSE
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Which type of vaccine has been used in place of inactivated whole cell vaccine?
A. Acellular subunit B. Whole cell attenuated C. Adjuvant D. Toxin
The principle of comparative advantage holds that nations should
a. specialize in activities for which they have the lowest opportunity cost. b. strive to become self-sufficient in production. c. produce only goods and services for which they have absolute advantage. d. become less labor-intensive and more capital-intensive.
The process by which living organisms maintain a fairly constant internal environment despite changes in the external environment is known as
A) metabolism. B) biology. C) homeostasis. D) evolution. E) chemistry.
What is the main unifying concept in biology, explaining how the diversity of life on Earth arose and how species change over time in response to changes in their environment?
a. evolution b. biodiversity c. environmentalismd. d. development