The class of antibody known as IgA is
A. Found in the mucous found in the respiratory, intestinal and genito-urinary tracts
B. capable of crossing the placenta from mother to fetus
C. It is formed of a single unit (monomer) of antibody molecule
D. It works only against viruses infecting the upper respiratory tract
Ans: A. Found in the mucous found in the respiratory, intestinal and genito-urinary tracts
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If a structure has no apparent function in one species, yet is homologous to a functional organ in another species, this structure is termed
A. homeotic. B. analogous. C. homologous. D. heterologous. E. vestigial.
The organism in the accompanying figure belongs to which group?
a. excavates b. alveolates c. stramenopiles d. green algae e. rhizarians
In knockout experiments,
a. genes are removed from chromosomes. b. normal genes are replaced physically by mutated genes. c. wild type genes are mutated to prevent their transcription or translation. d. mRNAs are prevented from attaching to ribosomes. e. the protein products of specific genes are inactivated.
What is Muller's Ratchet theory?
What will be an ideal response?