A mother, father, and son live together in the same house. The mother passes a cold to her son. The son then passes the cold to his father. If the virus has not mutated, should the mother be worried about catching the cold again from her husband?
A) No, memory cells will help the mother's immune system to quickly eliminate the virus.
B) Yes, although the mother has produced some antibodies to the cold virus, it can still overwhelm her immune system.
C) No, the T cells that are left from the previous infection can kill off any virus.
D) Yes, the immune system will treat the cold virus like a new infectious agent.
A
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Which of the following is/are true about endotoxins?
A. Lipid A is the toxic portion of the molecule. B. The toxic effects depend on the bacteria from which it came. C. The lipid A is immunogenic. D. They are proteins. E. The toxic effects depend on the bacteria from which it came AND they are proteins.
Mendel crossed two pea plants with round seeds. All seeds of the offspring were round. He then crossed a plant with round seeds to a plant with wrinkled seeds and all offspring had wrinkled seeds. Which of the following is true?
A) a mutation occurred B) the plants he used were not true breeding C) wrinkled is dominant D) round is dominant E) the trait does not breed true
What is a significant difference between X-linked and sex-influenced inheritances?
A) X-linked inheritance affects females and sex-influenced inheritance affects males. B) Sex-influenced inheritance requires epistasis. X-linked inheritance does not. C) There are no differences. They are the same. D) X-limited inheritance is only recessive. Sex-influenced inheritance can be recessive or dominant. E) In X-linked inheritance, the gene in question is on the X chromosome; in sex-influenced inheritance, the gene is autosomal.
Viroids infect
A. bacteria. B. plants. C. fungi. D. plants and animals. E. all organisms.