The lectin pathway for complement action is initiated by
A) mannose on host membranes.
B) mannose on the surface of microbes.
C) lectins of the microbe.
D) gram-negative cell walls.
E) gram-positive cell walls.
B
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Epigenetic inheritance
A. only refers to autosomal genes. B. only effects female offspring. C. only effects male offspring. D. can result in the expression of different alleles in different generations. E. only refers to X inactivation.
Which of the following is NOT true concerning
plants? a. There are at least 295,000 kinds of existing plants. b. Plants affect the composition of the atmosphere. c. Flowering plants are the dominant group in most regions. d. The colonization of the land by plants made it possible for animals to live and evolve on land. e. Plants resupply atmospheric oxygen by splitting CO2 during photosynthesis.
The only source of all new alleles is:
a. natural selection. b. genetic drift. c. gene flow. d. mutation. e. genetic polymorphism.
When a cell nucleus from an adult organ (eg. heart, muscles) is inserted to another enucleated cell, it gives rise to a new replacement tissue for that organ. This procedure is known as
A) Embryo cloning B) Adult cloning C) Therapeutic cloning D) None of the above