Antibodies binding to their antigen can activate complement. This, in turn, leads to opsonization of the antigen-antibody complexes. What is meant by opsonization?
A. Clumping of antibody-antigen complexes into insoluble substances.
B. Clumping together of the antibody-antigen complexes.
C. Coating antibody-antigen complexes, making them more easily phagocytized by macrophages and neutrophils.
D. Lysis of the cells bearing the antibody-antigen complexes.
Answer: C. Coating antibody-antigen complexes, making them more easily phagocytized by macrophages and neutrophils.
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If a combination of two or more genes is required to produce a specific trait, it is called a(n) _______
A. overdominance B. simple mendelian trait C. sex-influenced trait D. sex-linked trait E. gene interaction
The strobilus of a spike moss contains:a
an apical meristem. b. both microsporangia and megasporangia. c. microsporangia only. d. megasporangia only. e. a plant embryo.
You are interested in expression of regions of the X chromosome at different times in human fetal development. You hypothesize that large regions of the X chromosomes will be expressed at times when parts of the reproductive organs are developing
What structural and chemical characteristics of the X chromosome might you look at over time to determine when expression of genes on the X chromosome is enhanced or repressed? What will be an ideal response?
Why are dwarf pea plants shorter than other pea plants?
a. because they produce very little gibberellin hormone b. because they have an altered gibberellin amino acid sequence c. because the enzymes involved in gibberellin synthesis are missing d. because they cannot make any gibberellin