Exam 13: Nutrients of Life

Consider the mRNA sequence: auggacccagcgugaugua. If the second G from the left, shown in bold, were somehow deleted in this mRNA sequence in would it cause in problem in the gene?

Which of the following polysaccharides is indigestible by humans but digestible by microorganisms that live in the digestive tracks of termites?

Why does starch begin to taste sweet after it has been in your mouth for a few minutes?

Is it misleading to advertise a food product containing glycerol and fatty acids but no triglycerides as being fat-free?

The following statement describes what level of structure in a protein? The chain of amino acids layers into a large sheet.

Which of the following statements is true about fats in the diet?

Two of the most abundant minerals in our diet are ________.

What type of molecular attractions would you expect to occur between two threonine amino acids within a folding polypeptide chain? (See Figure 13.16 of your textbook for the structure of this amino acid.)

Which of the following statements is true about metabolism?

What is unique about the polysaccharides that are involved in human digestion?

Glycogen can be easily and rapidly converted to glucose because ________.

Silk contains many pleated sheets, which consist predominately of amino acids such as phenylalanine and valine. Silk is more waterproof than cotton. Why?

What is the main difference between the two forms of starch produced naturally?

What is the main compound formed in the digestion of carbohydrates?

Which of the following is NOT a matched pair of: a protein's structural level name and an example of that level?

Which of the following abbreviations for nitrogenous bases is found only in RNA?

Which element plays a major role in the structure of bones, ATP production, and DNA?

A common source of DNA damage is the spontaneous loss of the amine group on cytosine, which then transforms into uracil. This occurs at a rate of about 100 times a day. Fortunately, the body produces enzymes able to detect and repair such uracils back into cytosine. Given this information, suggest why DNA differs from RNA in possessing the nucleotide thymine rather than uracil.