Prions
What will be an ideal response?
-acellular
-brain infections
-abnormally folded proteins
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Which of the following statements are true regarding heavy (H) chains? Select all correct choices
A. Antibodies contain two heavy chains. B. Heavy chains contain variable and constant regions. C. Heavy chains are formed by the recombination of V, J, and C gene segments. D. Heavy chains are formed by the recombination of V, J, C, and D gene segments. E. Heavy chains contain only a hypervariable region.
Fertilization of plant gametes produces a
a. zygote. b. gametophyte. c. spore. d. meiospore. e. multicellular haploid plant.
According to the current theory of antibody formation
A. gene clusters are identical in all antibody-forming cells. B. antibody gene clusters are closely linked. C. gene fusion accompanies B cell maturation. D. each B cell can make many types of antibodies. E. all germ cells carry only one V gene.
A mycologist visits your biology class and discusses her research on a particular fungus that lives on the bark of damaged spruce trees. She explains that the fungal hyphae of her research organism is heterokaryotic. You raise your hand and request that she define that word. Her correct response is
A. heterokaryotic means that each compartment of the hyphae contain two distinct nuclei. B. heterokaryotic means that the nuclei of each compartment of the hyphae are genetically distinct. C. heterokaryotic means that each compartment of the hyphae contains only one nucleus. D. heterokaryotic means that the nuclei of the fungal hyphae are genetically the same.