When collagen is hydrolyzed it forms gelatin, the main ingredient of a jiggly dessert adored by children. What parts of a cow provide a rich source of collagen?

A. glandular organs
B. skin, tendons, and cartilage
C. heart and other muscles
D. brain


Answer: B

Biology & Microbiology

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Approximately _____ percent of the Earth’s water is salt water

a. 3 b. 50 c. 65 d. 98

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In transcription, one DNA strand is transcribed into a(n) ________ RNA strand, which is translated into protein.

A) ribosomal B) transfer C) messenger D) anticodon

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According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?

A) from infoldings of the plasma membrane, coupled with mutations of genes for oxygen-using metabolism B) from engulfed, originally free-living prokaryotes C) by tertiary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes E) when a protoeukaryote engaged in a symbiotic relationship with a protobiont

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