__________, or four-legged walkers, evolved from

lobe-finned bony fishes. Fill in the blank(s) with the appropriate word(s).


Answer: Tetrapods

Biology & Microbiology

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Genetic drift can eliminate alleles from a population more quickly than natural selection

Indicate whether the statement is true or false.

Biology & Microbiology

If the DNA nucleotides read ATG-CGT-GAC, the

amino acid sequence of the resulting polypeptide would be a. tyrosine – alanine – leucine. b. methionine – arginine – asparagines. c. histidine – glycine – praline. d. serine – lysine – glycine. e. all of these.

Biology & Microbiology

Generally, animals cannot digest (hydrolyze) the glycosidic linkages between the glucose molecules in cellulose. How then do cows get enough nutrients from eating grass?

A. They have to eat a lot of it. B. Microorganisms in their digestive tracts hydrolyze the cellulose to individual glucose units. C. Cows and other herbivores are exceptions and make some cellulose-digesting enzymes. D. The flat teeth and strong stomach of herbivores break the cellulose fibers so that the cows get enough nutrition from the cell contents. E. All of the above.

Biology & Microbiology

Which of the following is a source of electrons that plants use for reduction reactions during photosynthesis?

A) CO2 B) RuBP C) O2 D) H2O E) Glucose

Biology & Microbiology