Superantigens are
A. cell markers found in some member of a species but not in other members.
B. bacterial toxins that activate T-cells at a 100 times greater rate than other antigens.
C. body tissues that the immune system mistakes as foreign.
D. those that evoke allergic reactions.
Answer: B
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A researcher is studying several different Rhodnius mutants. One of her mutants only molts normally up until the 2nd nymph stage. After that, insects continue to molt but keep demonstrating body plans of the 2nd nymph stage
What is the likely effect of this mutation in Rhodnius? Choose all that apply. A. The juvenile hormone is not expressed B. The ecdysone hormone is not expressed C. The prothoracicotropic hormone (PTTH) is not expressed D. The juvenile hormone is over-expressed E. The ecdysone hormone is over-expressed F. The prothoracicotropic hormone (PTTH) is over-expressed
If rotifers have a diploid number of 38, how many chromosomes would be found in a sperm
cell?
a. 38 b. 19 c. 76
Identify and describe the functions of three different types of epithelial tissues. What will be an ideal response?
Carbon dioxide can be transported in the blood by all of the following methods, EXCEPT
A) dissolved in plasma as CO2. B) as CO within red blood cells. C) bound to hemoglobin. D) carried in plasma as HCO3-.