are human cells 20 Which of the following statements is not true of the

Are human cells 20 which of the following statements

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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.
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(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
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