are human cells 20) Which of the following statements is not true of the lysosome? Correct answer: it is involved in the packaging and secretion of cell products (this is true of the golgi apparatus) True statements regarding the lysosome: - it functions in intercellular digestion - both ER and Golgi apparatus are involved in its formation - it is capable of degrading most biomolecules - it is involved in pathological conditions such as gout and rheumatoid arthritis supramolecule Quiz 3 1) Which of the following is not an important noncovalent interaction of living organisms? Correct answer: carbon hydrogen bonds The important noncovalent interactions of living organisms are: Ionic interactions - between charged atoms/groups, nondirected (felt uniformly in space around center of charge), attraction of oppositvely charged amino acid side chains forms salt bridges , oppositely charged AA important feature in protein folding, enzyme catalysis, and molecular recognition Van der waals interactions - relatively weak electrostatic interactions that arise when biomolecules containing neutral permanent dipoles approach each other or an inducible dipole (such as a pi cloud) more polar = strong van der waals three types of van der waals forces: 1) Dipole-dipole interactions - forces occurring between molecules containing electronegative atoms, cause molecules to orient themselves so the positive end of one polar group is directed toward the neg end of another.
(i.e. hydrogen bonds - especially strong type of dipole- dipole interaction) 2) Dipole-induced dipole interaction - permanent dipole induces transient dipole in nearby molecule by distorting its electron distribution, weaker than dipole-dipole interactions 3) Induced dipole-induced dipole interactions - the motion of electrons in nearby nonpolar molecules results in transient charge imbalance in adjacent molecules. Very weak attractive charge often referred to as London dispersion forces . Although individually weak, interactions extending over the length of DNA molecule provide significant stability Hydrogen bonds - covalent bonds between hydrogen and oxygen or nitrogen are sufficiently polar that the hydrogen nucleus is weakly attracted to the lone pair of electrons of an oxygen or nitrogen on a neighboring molecule. Because the interaction is partially covalent the force has directionality cause of other properties of water (i.e. surface tension and viscosity) - Noncovalent interactions are usually electrostatic (occur between the positive nucleus of one atom and the negative electron clouds of another), relatively weak/easily disrupted- still play vital role in determining physical and chemical properties of water and structure/function biomolecules bc of cumulative effect
- Spring '19
- Correct Answer