BIO

Which of the following complex carbohydrates is listed with its correct function? Cellulose: structural component of plant cell walls Starch: primary energy-storage molecule in animals Amylose: main component of plant starch Chitin: constituent of bacterial cell walls

Cellulose is indeed the main structural component of plant cells walls

Which molecule is not a carbohydrate? Lipid Starch Glycogen Cellulose

A lipid is a hydrophobic polymer, not a carbohydrate

Which polysaccharide contains a modified monosaccharide? Peptidoglycan Glycogen Cellulose Starch

The N-acetylglucosamine and N-acetylmuramic acid units that make up peptidoglycan are composed of modified glucose monomers.

Which part of an amino acid is always acidic?

The carboxyl group (COOH) contains two oxygen atoms that tend to pull electrons away from the hydrogen atom, so this group tends to lose a proton and is acidic

Which of the following is not attached to the central carbon atom in an amino acid?

The central carbon atom in an amino acid is bonded to an amino functional group, a carboxyl functional group, a side chain, and hydrogen.

True or false? Peptidoglycan is a polysaccharide found only in bacteria.

True

What do phosphoglycerides and fats have in common?

Great choice! Like fats, phosphoglycerides are made by coupling fatty acids to glycerol by means of ester linkages.

Which of the following statements about monosaccharide structure is true? All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms. Aldoses and ketoses differ in the position of their hydroxyl groups. Monosaccharides can be classified according to the spatial arrangement of their atoms. A six-carbon sugar is called a pentose.

Monosaccharides can be classified according to the spatial arrangement of their atoms

Which monomers make up RNA?

Nucleotide monomers make up nucleic acids

Which polymers are composed of amino acids?

Proteins are composed of amino acids joined together

To find the best source of phospholipids, look at ... storage droplets. surfaces of leaves. nasal mucus. membranes. cell walls.

A fine choice. The great majority of a cell's phospholipids occur in membranes.

True or false? Enzymes in the digestive tract catalyze hydrolysis reactions.

Enzymes in the digestive tract break down food molecules, which is a process that occurs by hydrolysis.

Phospholipids are most important for ... lubricating cells. preventing leakage from cells. stiffening cells. waterproofing cell walls. storing energy.

preventing leakage from cells. Every cell depends on phospholipid bilayers to limit leakage of molecules through membranes

Which of the following statements about the formation of polypeptides from amino acids is true?

A hydroxyl group is removed from the carboxyl group of one amino acid and hydrogen is removed from the amino group of the other amino acid, allowing a bond to form between the two groups.

Which complex carbohydrate contains only a-1,4-glycosidic linkages?

Amylose is formed from a-1,4-glycosidic linkages of glucose