In human lungs, gas exchange occurs at the _____

a. two bronchi c. alveolar sacs
b. pleural sacs d. both pleural sacs and alveolar sacs


C

Biology & Microbiology

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The three-dimensional shape of a protein is determined by the ____ and the results of chemical modifications and other processing events

a. interaction of R groups b. interaction with other polypeptide chains c. amino acid sequence d. bonds formed with other proteins e. initiation complex

Biology & Microbiology

The temperature of the lower atmosphere has risen the most

a. in the last 150 years. b. in the last 60 years. c. in the last 250 years. d. in the last 100 years. e. in the last 1000 years.

Biology & Microbiology

What is the structure of the large polytene chromosomes found in some tissues of dipteran larvae?

What will be an ideal response?

Biology & Microbiology

In mammals, uric acid is produced as a waste product of the degradation of

A. proteins. B. lipids. C. polysaccharides. D. purine nucleotides.

Biology & Microbiology