Water molecules are polar with ends that exhibit partial positive and negative charges. These opposite charges allow water molecules to attract each other through:
A. ionic bonds.
B. covalent bonds.
C. hydrogen bonds.
D. peptide bonds.
C
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Which of the following is NOT true of fibrous,
irregular connective tissue? a. Its matrix is packed with fibroblasts. b. Its matrix is packed with collagen fibers. c. It is mainly associated with the skeletal system. d. It is a component of the skin. e. It forms protective capsules around some organs.
Which of the following statements about
complement proteins is false? a. flag antigens for destruction b. can destroy pathogens directly c. enhance lymphocyte response d. exclusively bacterial DNA associated e. none of these are correct
Human blood types involve all of the following except
A. ABO antigen markers. B. genetically determined glycoprotein markers. C. inheritance of two of three possible alleles. D. genes that code for an enzyme that adds a terminal carbohydrate to RBC receptors. E. MHC genes.
Organism A has 70 moles % G+C, and organism B has 40 moles % G+C. Which of the following can be concluded from these data?
A) The two organisms are related. B) The two organisms are unrelated. C) The organisms make entirely different enzymes. D) Their nucleic acids will completely hybridize. E) None of the answers is correct.