W hat was the major stumbling block for the acceptance of natural selection as a mechanism for evolution when proposed by Darwin?

a. lack of a fossil record
b. lack of observational and experimental data
c. lack of a plausible theory of heredity
d. lack of evidence for artificial selection


Answer: c. lack of a plausible theory of heredity

Biology & Microbiology

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About 4% of those of Northern European descent are carriers for ____, an autosomal recessive genetic

disorder where a defective membrane transport protein leads to abnormal chloride levels in extracellular fluids.

a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis

Biology & Microbiology

Which of the following can result in speciation

within a few generations? a. development of a physical barrier b polyploidy c. postzygotic isolating mechanisms d. change in environmental conditions e. the introduction of a new predator into an area

Biology & Microbiology

Receptors on the surface of pathogens that are made of glycoproteins and lipoproteins are called

a. capsules. b. slime layers. c. adhesins. d. adhesives.

Biology & Microbiology

)

A. These infections commonly occur in healthy individuals. B. E coli that causes UTIs is an example of a common opportunistic pathogen. C. Very young and very old patients are most susceptible to opportunistic infections. D. The presence of other pathogens in a patient has no effect on the development of opportunistic infections. E. Cancer patients are at a higher risk for opportunistic infections.

Biology & Microbiology