CoreyHammond6247
06.12.2019 •
Biology
Question 1
why are all the people on earth members of the same biological species?
all people have the same genetic makeup.
all people originated from the continent of africa.
all people have adaptations that allow them to live anywhere on earth.
all people can mate with one another and have children.
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question 2
according to scientific thought, when does one species of organisms become two species?
when populations become separated from one another
when one population becomes extinct
when one population cannot interbreed with the other population
when populations compete for the same resources
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question 3
which stage is the middle stage of speciation?
the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.
the populations are isolated and thus do not interbreed.
the populations become totally separated from one another.
the populations successfully interbreed.
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question 4
which stage is the first stage of speciation?
the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.
the populations are isolated and thus do not interbreed.
the populations become totally separated from one another.
the populations successfully interbreed.
2 points saved
question 5
the colorado river carved out a deep canyon in the habitat of an abert’s squirrel population. this is an example of which stage of speciation?
the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.
the populations are isolated and thus do not interbreed.
the populations become totally separated from one another.
the populations successfully interbreed.
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Ответ:
11. D. All people can mate with one another and have children.
Explanation:
A biological species is defined as group of individuals which can interbreed among themselves and can produce fertile progeny. Since all the people on Earth can interbreed among themselves to produce fertile offspring, they can be considered as "biological species". Reproductive barrier define the biological species.
Ответ:
This enzyme facilitates the removal of an amino group from the organic compound so it can be converted into an intermediate compound for the krebbs cycle.
Explanation:
An organism’s ability to produce the enzyme deaminase can be tested using the phenylalanine deaminase medium. Phenylalanine is an amino acid that contains amino group. The enzyme deaminase removes the amino group from this as free ammonia.
In the testing medium containing phenylalanine 10% ferric chloride is added after sufficient incubation. In the case of organisms that produce deaminase enzyme they phenyl pyruvic acid will be produced in the medium. This phenyl pyruvic acid will then react with ferric chloride and turn dark green.
In organisms that do not produce the enzyme no such reaction will take place and the medium will maintain the straw color.