Genetic variations are the raw material for evolution. natural selection cannot act upon these variations unless which factor is present? a. the genetic variations produce only unfavorable characteristics b. the genetic variations produce only favorable characteristics c. the genetic variations are found in fossil records of the population d. the genetic variations are in the phenotype of the organism
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Biology, 22.06.2019 03:00
Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.
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Biology, 22.06.2019 05:50
The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes
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Biology, 22.06.2019 06:30
Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?
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Biology, 22.06.2019 07:00
What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material
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Genetic variations are the raw material for evolution. natural selection cannot act upon these varia...
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