Which three components are common to all amino acids?
answer
an amino group, a carboxyl group, and an R group
question
Which pair of statements best describes an essential amino acid?
answer
It is an amino acid that cannot be made by the body. It must be obtained from eating certain foods.
question
Lactase is an enzyme that is produced in the lining of the intestines. This enzyme helps the body speed up the breakdown of carbohydrates that are found in dairy products, such as milk, yogurt, and cheese.
Which general function does lactase perform?
answer
regulating cell processes
question
Who first identified nucleic acids, and where were they discovered?
answer
Friedrich Meischer discovered nucleic acids in blood cells.
question
Which element is found in nucleic acids but not in proteins?
answer
phosphorus
question
Which protein serves as a chemical messenger?
answer
insulin
question
Which statement is true about BRCA1 and BRCA2 genes?
answer
People can be tested for mutations on these genes.
question
DNA and RNA share a number of similarities, but they also differ in certain aspects of their structure.
Which nitrogenous base is found in RNA but is not found in DNA?
answer
uracil or thymine
question
How many amino acids cannot be made by the body, so they must be obtained in the diet?
answer
10
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