How do superantigens enable pathogens to hide from the immune system if they actually stimulate the immune system?
A) They cause fever, which destroys the complement proteins.
B) They cause the immune system to destroy IgA antibodies.
C) They cause the immune system to turn on itself.
D) They cause the immune system to produce an exaggerated response, distracting it from the actual pathogen.
Answer: D) They cause the immune system to produce an exaggerated response, distracting it from the actual pathogen.
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You discover a gene that results in a complete lack of hair in rats, and you name the gene "chromedome." A cross of homozygous normal and homozygous bald rats results in all bald rats. You conclude that the baldness allele is dominant, but when you repeat the cross with different rats none of the offspring are bald. Extremely puzzled you study your records and discover that in the first cross the bald rat was female, while in the second cross the bald rat was male. What do you conclude from this information?
A. Chromedome is imprinted in females. B. Chromedome is imprinted in males. C. Chromedome is dominant in females and recessive in males. D. Chromedome is dominant in males and recessive in females. E. Chromedome is an X-linked gene.
What type of bond contributes to a protein's secondary structure?
a. peptide bonds b. covalent bonds c. ionic bonds d. hydrogen bonds e. protein bonds
An animal that has a four-chambered heart, is endothermic, and does not give birth to live offspring can be classified as a(n)
A) amphibian. B) mammal. C) mollusk. D) reptile. E) bird.
Choose the letter of the best match from the following:A. hypocotylB. endospermC. scutellumD. radicleE. epicotylA single cotyledon found in the kernels of cereal grains.
Fill in the blank(s) with the appropriate word(s).