What type of immune response is always disadvantageous to a person?
A) inflammatory
B) humoral
C) autoimmune
D) complement-mediated
Answer: C
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You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l- b+ b-) flies are normal, but ( l- l- b- b-) flies don't move around very much and cannot detect the location of a light source. You perform a testcross and get the following results:
listless, sighted 100 listless, blind 400 normal activity, sighted 400 normal activity, blind 100 What is the distance between these two genes on the chromosome? A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.
____ of our food crops are the fruits of angiosperms
a. About 10% b. About 25% c. About half d. Nearly all e. Hardly any
Amphibians evolved from
A. bass and bluegill. B. sturgeon and catfish. C. lobe-finned fishes with lungs. D. sharks. E. darters.
Hydrogen bonds are found in all of the following EXCEPT
A) between phosphates in ATP. B) in ?-helices. C) between water molecules. D) in the DNA double helix between nucleotides. E) between the R groups of amino acids in proteins.