Homeotic genes of Drosophila:a
cause cells of the same type to produce differing amounts of gene products.
b. specifies the developmental plan for each part of each segment.
c. are expressed in only one sex in any particular species.
d. when mutated, cause body parts to be duplicated.
e. control developmental timing.
A
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Despite the aggressive defense of the cardiovascular system by the immune system, some microbes can invade and establish an infection in the blood. From the following list of microbes and their virulence factors, identify the mismatch.
A. Borrelia burgdorferi changes its surface antigens to avoid immune recognition. B. Coxiella burnetii produces an endospore-like structure. C. Trypanosoma cruzi cloaks itself in host proteins to avoid immune recognition. D. Bacillus anthracis produces antioxidants to combat lysosomes.
The highest level of the hierarchical classification of life is the ____
a. biosphere b. domain c. ecosystem d. population e. cell
The advantage of having memory cells in specific defenses is that
A) they remain in an active state, continuously producing antibodies. B) if exposed to an antigen a second time, they quickly become plasma cells. C) they prevent production of other proteins so that antibodies can be produced. D) they produce antibodies and can become phagocytic. E) they prevent viruses from entering the body a second time.
The uncoiled DNA in a eukaryotic cell is much longer than the cell itself
Indicate whether the statement is true or false