Both mechanical and limited chemical digestion occurs in the mouth.
Indicate whether the statement is true or false.
Answer: True
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Which of the following pHs has the highest
concentration of hydrogen ions?
a. 1 b. 3 c. 5 d. 7 e. 9
The prevalence rate of tuberculosis in one particular county in Texas is 7/1000 people, while the incidence rate for 2011 is 2/1000 people. Analyze this data and summarize the situation.
A. Incidence rate should really be higher than prevalence rate because it includes all new cases for the year. B. The data were collected incorrectly because the two values should match. C. Prevalence rate is higher than incidence rate because the number of people still alive with tuberculosis is higher because of better treatments. D. Prevalence rate and incidence rate cannot be determined for the same disease.
You are researching a cytoplasmic protein associated with a nerve disorder. The native form of the enzyme appears to be globular protein; however, when a sample of the purified protein is treated with a chemical that reduces disulfide bonds,
the enzymatic activity decreases dramatically and multiple globular proteins can be detected in the sample. What does this tell you about the protein? A) The primary structure of the protein contains multiple cysteine residues that are hydrolyzed by the chemical reductant. B) The protein is most likely composed of multiple polypeptide chains that are held together by disulfide bonds. C) The protein is most likely composed of ? helices that are held together by disulfide bonds. D) The protein is most likely composed of ? sheets that are held together by disulfide bonds. E) The primary and secondary structure of the protein depends on disulfide bonds.
Bones of trained athletes may be visibly thicker and heavier than those of nonathletes because
A) athletes have lower blood calcium levels than nonathletes. B) weight-bearing exercise increases bone mass and strength. C) nonathletes have a low parathyroid hormone rate. D) athletes produce more growth plates. E) nonathletes produce fewer osteoids.