Biology, 25.01.2020 06:31 wildfire771003
Two populations of a species of squirrel are geographically isolated from each other. although they have the same population density, one population is significantly larger in number than the other. a new bacterial disease, which is easily spread and extremely virulent, affects both populations at the same time.
which of the following is the best prediction of how the new disease will affect the two populations?
(a) the two populations will be equally affected, because the ability to trigger an immune response is randomly distributed among all squirrels of that species.
(b) the larger population will be less affected by the disease than will the smaller population, because the mutation rate of the larger population is higher than the mutation rate of the smaller population.
(c) the smaller population will be more affected than will the larger population, because the smaller population has less genetic variation than the larger population has.
(d) the smaller population will be less affected than will the larger population, because the smaller population exhibits more genetic drift than the larger population exhibits.
Answers: 3
Biology, 22.06.2019 01:10
Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.
Answers: 1
Biology, 22.06.2019 01:30
Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.
Answers: 1
Biology, 22.06.2019 08:30
What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna
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Two populations of a species of squirrel are geographically isolated from each other. although they...
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