Between which individuals would an organ transplant have the least chance of rejection?
1.siblings
2.fraternal twins
3.identical twins
4.mother and child
3
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Which of the following statements is NOT true of Gram-positive bacteria?
A. They have a thicker peptidoglycan layer than do Gram-negative bacteria. B. They turn purple when subjected to the Gram-staining process whereas Gram-negative bacteria stain pink. C. They lack the lipopolysaccharides that Gram-negative bacteria have. D. They are less resistant to antibiotics than Gram-negative bacteria. E. They have a gram molecular weight of more than 1.0 whereas Gram-negative bacteria have a gram molecular weight of less than 1.0.
The ozone layer is valuable because it blocks
a. heat. b. UV radiation. c. radio waves. d. asteroids. e. X-rays.
A magnesium ion contains twelve protons and ten electrons. A chloride ion contains seventeen protons and eighteen electrons. Given this information, the chemical formula for magnesium chloride is
A. MgCl. B. Mg2Cl. C. MgCl2. D. Mg2Cl2.
Activity of CDKs is mediated by:
a. cyclins b. checkpoints c. growth factors d. nuclear lamins e. receptors