Which of the following organelles breaks down worn-out organelles?
a. Golgi apparatus
b. lysosomes
c. smooth endoplasmic reticulum (ER)
d. rough endoplasmic reticulum (ER)
e. mitochondria
Answer: b. lysosomes
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Answer the following statements true (T) or false (F)
1. IgA antibodies are involved in passive immunity. 2. RAG-1 is an enzyme involved in creating immunoglobulin light chains. 3. Hypermutation refers to the process by which immunoglobulin gene domains recombine to form a diverse array of antibodies. 4. The only cell type that can present antigens to helper T cells is the macrophage. 5. Cytotoxic T-cell activation requires the presentation of the same antigen by macrophages and (somatic) body cells.
During the Olestra experiment what was the independent variable? a. The group that received Olestra chips
b. The group that became ill. c. The presence or absence of Olestra. d. How ill the individuals became. e. The group that received plain chips.
The skin would be an example of
a. a first line of defense. b. a second line of defense. c. a third line of defense. d. all of these. e. none of these.
Any chemical interaction between atoms:a
involves neutrons. b. may potentially involve any electron. c. involves protons. d. involves only valence electrons. e. involves only the nuclear subatomic particles.