The presence of lipid A in the outer membranes of Gram-Negative bacteria:
A) Affects the formation of blood clots in the host
B) Causes these bacteria to be oxidase positive
C) Triggers the secretion of a protease enzyme to cleave IgA in mucus
D) Enables enteric bacteria to ferment glucose anaerobically
Ans: A) Affects the formation of blood clots in the host
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A mutation in which one of the ADH enzymes is overactive causes ________
a. the carrier to be unlikely to become an alcoholic b. all of the choices c. acetaldehyde to accumulate d. the carrier to become flushed and ill after drinking alcohol
Four of the five answers listed below are related to pairing of chromosomes. Select the exception.
a. synapsis b. pairing of homologues c. interkinesis d. exchange of genes e. crossing over
The telencephalon region of the developing brain of a mammal _____
A) divides further into the metencephalon and myelencephalon B) develops from the midbrain C) is the brain region most like that of ancestral vertebrates D) gives rise to the cerebrum
Which examples would be considered different species under the biological species concept? Check all that apply.A) Two bear species are able to breed in zoos, but have separate ranges in nature.B) Two skunk species look morphologically similar, but are unable to interbreed.C) Two snake species look different, but often form fertile hybrids.D) Two plant species with no gene flow between them.E) Two tree species have different leaf shapes, but form hybrids in their overlapping ranges.
What will be an ideal response?