The part of the antibody that binds an antigen:a
is known as the Fc fragment.
b. is called an epitope.
c. makes up the tail of the Y-shaped molecule.
d. recognizes the antigenic determinant of that antigen.
e. is known as the constant segment.
D
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Both pathogenic bacteria and primary symbionts have a tendency to lose genes for catabolic pathways
Indicate whether the statement is true or false.
In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ? silver >>> all silver offspring; (2) silver ? platinum >>> equal numbers of silver and platinum; (3) platinum ? platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
Mutations in human DNA rarely impair normal cell function because
A) repair of DNA prevents all mutations from ever causing damage to a cell. B) damaged cells commit "suicide" to prevent damage to the body. C) cells have one major repair enzyme that corrects the mutations quickly. D) multiple DNA repair enzymes usually quickly correct the mutations before any damage can occur. E) the cells attack dysfunctional gene products, averting damage to the cell.
What statement best summarizes the evolutionary history of eyes?
A. Eyes evolved once and were slightly modified in different phyla. B. Eyes evolved separately in each phylum from an ancestor with no ability to detect light. C. Light-detection organs can develop with very little developmental constraint. D. Development of light-sensing organs evolved once, but several eye structures evolved separately.