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
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Which of the following components of a virus is not encoded by its own genome?
A. capsid B. lipid bilayer of viral envelope C. spike glycoproteins of viral envelope D. bacteriophage anchoring structures E. tail fibers
Approximately _____ percent of the Earth’s water is salt water
a. 3 b. 50 c. 65 d. 98
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
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