What process generates many B cells and T cells that are activated against specific antigens?
A. Clonal expansion
B. Antibody production
C. Antigen presentation
D. Antigen expression
E. Opsonization
Answer: A
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From the aquatic systems below, where are heterotrophic Bacteria the MOST abundant?
A) coastal waters B) deep sea C) Sargasso Sea D) open ocean
The correct sequence of stages in mitosis is
(a) interphase, prophase, metaphase, anaphase, telophase. (b) prophase, metaphase, anaphase, telophase. (c) metaphase, anaphase, prophase, telophase. (d) prophase, telophase, anaphase, interphase.
Which two lipids are connected to the glucose pathway?
a. waxes and steroids b. steroids and triglycerides c. cholesterol and triglycerides d. waxes and cholesterol
Which of the following likely triggered the Holocene extinction?
a. European colonial expansion in the 1600s b. The rising popularity of zoos in the late 1800s c. A large asteroid hitting Earth more than 250 million years ago d. An unprecedented increase of photosynthetic organisms 2.45 billion years ago