Answer the following statements true (T) or false (F)
1. The membrane attack complex is involved in specific immune defense mechanisms.
2. During inflammation, nitric oxide secreted from endothelial cells causes swelling of the surrounding tissue.
3. The three major types of pathogens are bacteria, viruses, and cancer.
4. Helper T cells activate both B cells and cytotoxic T cells.
5. The first stage of a specific immune response is the activation of B cells and T cells.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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How many tetrads are present in a single elephant cell (2n=56) during metaphase I of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about tetrads? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Individuals heterozygous for the RB+ and RB? alleles can develop tumors as a result of (Select all that apply.)
A) a mitotic crossover that leads to homozygosity for RB+ in some cells and RB? in other cells. B) a somatic mutation in the RB+ allele that leads to homozygosity for RB?. C) a somatic mutation in the RB? allele that leads to homozygosity for RB+. D) the fact that RB? is dominant to RB+.
The elements that make up the bulk of the Human body are
A) Carbon, Water and Nitrogen B) Carbon, Hydrogen, Oxygen and Nitrogen, C) Carbon, Helium, Oxygen, Nitrogen and D) Carbon, Oxygen, Nitrogen and Iron
Which enzyme catalyzes the reaction: H2O2 + 2H+ ? 2H2O?
A) catalase B) oxidase C) peroxidase D) superoxide dismutase