Which phrase expresses what photons lack versus what they have a precise amount of?
a. mass versus atoms
b. atoms versus mass
c. energy versus mass
d. mass versus energy
Ans: d. mass versus energy
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Minick Rosing's analysis of microscopic globules of carbon found in rocks 3.7 billion years old showed that they were somewhat higher in 12C as opposed to 13C. This is significant because ________
A) 13C radiometrically decays into 12C, which lets us calculate the age of these rocks B) life could not have arisen in an environment with excessive 13C C) these carbon globules contain visible remains of cell walls and nuclei D) living things that fix carbon preferentially incorporate 12C over 13C E) meteorites must have brought 13C to the early Earth
The rate of decomposition is greatest in
A) cold and moist environments. B) cold and dry environments. C) warm and moist environments. D) warm and dry environments.
Dentists sometimes give a patient antibiotics after a teeth-cleaning procedure, especially if the patient is older or has heart disease. What is the best explanation for this?
A. The materials used during a teeth-cleaning procedure are high in low-density lipoproteins, and contribute to atherosclerosis. B. Antibiotics help remove the plaque that remains on the teeth after a teeth-cleaning procedure. C. Antibiotics help kill the bacteria that move from the mouth to the bloodstream, and prevent the bacteria from contributing to atherosclerosis. D. Teeth-cleaning procedures add bacteria to a person's mouth, and antibiotics are needed to control the bacteria.
The M protein enhances the virulence of Streptococcus by preventing phagocytosis
Indicate whether the statement is true or false