The following pedigree is showing the inheritance of a Y-linked disorder. What is the genotype of the 2nd born offspring (son) in generation III?
a) homozygous dominant
b) homozygous recessive
c) heterozygous
d) hemizygous
Ans: d) hemizygous
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In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the
regions of Spirogyra algae that were bathed in red, blue, and violet light?
a. Chlorophyll is green and thus reflects green light. b. The bacteria were immobile and that is where Engelmann happened to place them. c. Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions. d. Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions. e. The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultra violet and infrared).
Which number identifies the structure that facilitates movement?
a. 1 b. 2 c. 3 d. 4 e. 5
The difference between direct and indirect immunofluorescence testing is that
A. Indirect testing determines the identity of an unknown antigen in a patient sample, whereas direct testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera. B. Direct testing adds antibodies directly to antigens, whereas indirect testing cultures the organisms first and adds fluorescent tags to the patient sample. C. Direct testing determines the identity of an unknown antibody in a patient sample, whereas indirect testing determines whether the patient is infected with a specific antigen. D. Direct testing determines the identity of an unknown antigen in a patient sample, whereas indirect testing determines whether the patient has been exposed to an antigen as evidenced by the presence of antibodies in their sera.
A vaccine additive which enhances the body's natural immune response is called a(n)
A) adjuvant. B) toxoid. C) attenuant. D) recombinant. E) booster.