Which of the following items are typically irradiated in order to kill microbes?
A. operating room air
B. surgical gloves
C. human tissues such as heart valves and skin
D. ground beef and other meat and poultry
E. All of these choices are correct.
Answer: E
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Upon activation by stomach acidity, the secretions of the parietal cells _____
A) initiate the chemical digestion of protein in the stomach B) initiate the mechanical digestion of lipids in the stomach C) initiate the chemical digestion of lipids in the stomach D) include pepsinogen E) delay digestion until the food arrives in the small intestine
Fructose and glucose are
a. isotopes. b. monosaccharides. c. disaccharides. d. six-carbon sugars. e. monosaccharides and six-carbon sugars.
A tabacco plant can be made to express a gene from fireflies, resulting in the emission of light. Which of the following is the basis for this phenomenon?
A. Chloroplasts can be made to produce light if firefly proteins are injected into plant cells B. Fireflies and tobacco plants share a recent common ancestor C. Fireflies and tabacco plants are infected by the same kinds of bacteria D. Transcription and translation are fundamentally similar in both fireflies and tobacco plants E. Most enzymes in fireflies have the same amino acid sequence as the enzymes in tabacco plants
What are believed to be the evolutionary ancestors of mitochondria?
a. ancient Archaea b. ancient proteobacteria c. ancient green bacteria d. ancient cyanobacteria