In cohesion-tension theory, what molecular interactions allow water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?
A. Ionic bonds
B. Covalent bonds
C. Hydrogen bonds
D. Polar bonds
E. Nonpolar bonds
Answer: C
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Groups of related, but distinctly different genes that appear to have arisen from a single ancestral gene are referred to as
A. segmental duplications. B. pseudogenes. C. tandem clusters. D. multigene families. E. expressed sequences.
Which endocrine glands are involved in calcium homeostasis?
A) thyroid and parathyroid B) hypothalamus and pituitary C) thyroid and pancreas D) hypothalamus and adrenal gland
DNA polymerase is an enzyme that has several functions in DNA replication. Which of these is NOT a function of DNA polymerase?
A) adding nucleotides to a strand of DNA as it is being generated B) identifying incorrectly paired nucleotides in newly-generated DNA C) removing and replacing incorrect additions to a new strand of DNA D) breaking hydrogen bonds to allow double-stranded DNA to "unzip"
Anabolic reactions may be characterized as
A) exergonic. B) breaking large molecules into smaller molecules. C) forming large molecules from smaller molecules. D) producing ATP. E) breaking large molecules into smaller molecules to produce ATP.