Why is innate host resistance a type of nonspecific immune response?
A. Innate resistance is nonspecific because it depends on the life experience of the individual, for example, receiving a vaccine or acquiring a disease due to a particular pathogen.
B. Innate resistance is nonspecific because any foreign material, microorganisms, or antigens encountered by the host are targeted.
C. Innate resistance is nonspecific because any type of immune response, such as inflammation, phagocytosis, or humoral immunity, is activated in the host by foreign material.
D. Innate resistance is nonspecific because it is impossible to determine the specific degree by which any host will respond when foreign material or microorganisms are present.
Answer: B
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In the malarial life cycle, the male gamete is called ________.
A. oocyst B. microgametocyte C. ookinete D. macrogametocyte
An allele is ____ if its effect masks that of a
____ allele paired with it.
a. recessive; codominant b. codominant; recessive c. recessive; dominant d. dominant; recessive e. incompletely recessive; dominant
Imaginal discs are:a
found in mammalian cells and control gene activation in mature somatic cells. b. paired groups of undifferentiated cells that are precursors of adult structures in Drosophila. c. found in plant cells and assist in the development of the flower. d. part of the salivary gland of Drosophila. e. found in Drosophila ovary cells and represent inactivated X chromosomes.
The human genome
A. has a lot of foreign DNA scattered throughout the genome, including transposons. B. has a very small amount of foreign DNA, mostly in the end caps (telomeres) of chromosomes. C. has a lot of foreign DNA, mostly in the end caps (telomeres) of chromosomes. D. has no foreign DNA because it is excised by DNase.