The condition in the host that results from pathogenic parasitic organism growing and multiplying within or on the host is called
A. an infection.
B. pathogenesis.
C. an infectious disease.
D. All of the choices are correct.
Answer: A
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Which of these is a difference between a DNA and an RNA molecule?
a. DNA contains uracil, whereas RNA contains thymine. b. DNA is double-stranded, whereas RNA is single-stranded. c. DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars. d. DNA contains nitrogenous bases, whereas RNA contains phosphate groups. e. DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids.
Which researcher would be most accurately described as engaging in therapeutic cloning?
A. Ayame is working in a lab that is trying to induce the formation of new skin cells. B. Judith is transferring tadpole nuclei into denucleated frog eggs in order to grow adult frogs. C. Frederick is trying to produce a mammoth from nuclei extracted from ancient frozen mammoth tissue. D. Hans is trying to make an exact version of himself.
Within this community, which would be the fittest organisms?
a. The weeds with herbicide resistance because they survive when herbicides are sprayed. b. The weeds without herbicide resistance because they are producing the most surviving offspring. c. Any organism that reproduces is considered fit in the evolutionary sense. d. If herbicide resistance arose due to a mutation, this species would be considered less fit
A breeding experiment that checks for the relationship between the alleles of a single trait is called a ________. a. Punnett square b. None of these choices
c. dihybrid cross d. test cross e. monohybrid cross