unit 2 quiz reviews Flashcards
Starch and glycogen are both polymers of
alpha-glucose
Which of the following statements about starch and glycogen is false?
serve primarily as structural elements in cell walls
how to determine the melting point of fatty acids
Relative melting points for fatty acids can be estimated based on the length of their carbon chains and the number of cis double bonds. As you saw with hydrocarbons, longer carbon chains can experience stronger (London) dispersion forces and therefore require more heat to melt and therefore have higher melting points.
t or f: saturated fatty acids has a higher melting point than unsaturated fatty acids
true
Why do phospholipids and glycolipids form bilayers rather than micelles when placed in an aqueous media?
The two fatty acid chains present in glycolipids/phospholipods are too bulky to form micelles
Which of the following best describes steroid molecules?
Steroids are non-polar and can travel across the plasma membrane
Which of the following is false regarding steroids
steroids are the major component of plasma membrane
Which of the following is true regarding steroids
- Steroid hormones bind to receptors on the nuclear membrane
- All steroids contain at least 4 rings
- Steroids and triglcerides are both classified as the same type of macromolecule
sterols structure has what form
HO attached. four rings two low two high
peptide bonds
Peptide bonds are the covalent linkages that hold amino acids together in a polypeptide chain. These bonds are essential for the primary structure of proteins, but they do not directly contribute to the folded tertiary structure
Phosphodiester bonds
Phosphodiester bonds are found in nucleic acids (DNA and RNA), not proteins
Disulfide bonds
Disulfide bonds are important for stabilizing protein structure, but they are not the primary driving force for folding. These bonds form between cysteine residues and can help maintain the folded shape of certain proteins. However, hydrophobic interactions are generally more prevalent in stabilizing the overall fold of globular protein
The folded states of globular proteins in aqueous solutions are stabilized primarily by
Hydrophobic interactions are the main force driving the folding of globular proteins because nonpolar amino acids tend to cluster together in the interior of the protein, minimizing contact with wate
structural proteins like collagen is full of
Alpha-helices
enzymes are often a mix of
alpha-helices and Beta-sheets
protein are structurally stablilized by
Hydrogen bonds
Secondary structure refers to the local folding of the polypeptide chain into specific patterns like alpha helices and beta sheets. These patterns are primarily stabilized by hydrogen bonds between the backbone amino groups and carbonyl groups of the amino acid
Which is a characteristic of both an α-helix and a β-pleated sheet?
Both form interactions involving the oxygens of peptide bonds
competitive inhibitors vs noncompetitive inhibitors
Competitive inhibitors operate on the active site indirectly by competing with the substrate, whereas noncompetitive inhibitors bind directly to allosteric sites.
