How did the earliest single-celled microorganisms produce energy to drive metabolic processes?
A. Sulfuric acid, aerobic, and anaerobic respiration.
B. Sulfuric acid respiration.
C. Both aerobic and anaerobic cellular respiration.
D. Aerobic cellular respiration.
E. Anaerobic cellular respiration.
Answer: E
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A peptide bond _____
A) forms between the functional R-groups of different amino acids B) forms between the central carbon and the amino R-group of a single amino acid C) forms the primary structure of proteins D) does not play a role in maintaining the tertiary structure of proteins
Which of the following is true regarding hagfish and lampreys?
A. They are characterized by a bony lower jaw. B. They are invertebrates. C. They are bony fish. D. They are vertebrates.
What type of cells secrete antibodies?
A. Antigen-presenting cells B. Memory B cells C. Helper T cells D. Plasma cells E. Cytotoxic T cells
Which substance is found in RNA but not in DNA?
a. thymine b. deoxyribose c. uracil d. guanine e. cytosine