Biochemistry _ Carbohydrate and Protein

Which monosaccharide is commonly referred to as the "blood sugar" and is

an important energy source for cells?

• Glucose

• Fructose

• Galactose

• Sucrose

Which carbohydrate is stored in the liver and muscles as a source of energy?

• Glycogen

• Starch

• Cellulose

• Sucrose

Proteins are composed of

• nucleotides

• fatty acids

• amino acids

• monosaccharides

Enzymes increase the rate of chemical reactions by

• increasing temperature

• decreasing substrate concentration

• lowering activation energy

• increasing reaction time

The term "denaturation" refers to

• the activation of an enzyme.

• the inactivation of an enzyme

• the alteration of an enzyme's active site.

• the unfolding or disruption of an enzyme's structure.

Which one is the final product of anaerobic glycolysis?

• Lactose

• Acetyl-CoA

• Pyruvate

• Lactate

Which tissue will produce high level of ketone bodies (breakdown of fatty acids) during prolonged fasting?

• Brain

• Adipose tissue

• Liver

• Muscle

The coiled-coil structure is found in some proteins. Which of the following statements regarding the coiled-coil is TRUE?

• Is a type of quaternary structure

• Is a type of secondary structure

• Involves three alpha helices

• Is stabilized by a hydrophilic center

The amino acid Serine

• contains hydroxyl group in the side chain.

• has positively charged side chain at physiological pH.

• is a sulfur containing amino acid.

• has negatively charged side chain at physiological pH.

The primary structure of a protein is determined by

• the folding of the protein into its final shape

• the sequence of amino acids in the protein.

• the interaction of the protein with other molecules.

• the location of disulfide bonds.