The ability of non-polar substances like fat molecules to clump together in water thereby allowing minimal contact between the fat molecules and water is attributed to: Group of answer choices a. Hydrogen bonds b. Ionic bonds c. Van der Waal’s interactions d. Hydrophobic interactions e. Cystine bridges

Above is trehalose dimycolate, a lipid that allows the bacteria that cause tuberculosis to spread throughout the lung. What is the best way to classify this molecule? :positively charged :mostly hydrophobic :negatively charged :polar :hydrophilic

Which one of the following statements about a molecule of acetonitrile (CH3CN) is TRUE? Select one: o a. It has four single bonds o b. It has three single bonds and two lone pairs of electrons c.It has one multiple bond d. It has two nonbonding pairs of electrons e. It has five covalent bonds

One of the most important properties of water is that it can form a _______ with other water molecules. This means that water molecules are able to “stick together” to a certain extent. The term for this property is cohesion. A. Ionic bond B. Covalent Bond C. Hydrogen Bond

Answer the following about drawing the attractive force between a water molecule (H2O) and an ammonium ion (NH4*). The on the O in the water molecule is attracted to the of the ammonium ion. a. partial + charge b. partial - charge c. full + charge d. full - charge

This atom (group) is removed and converted to an ammonium ion, which ultimately is excreted from the body as urea. O A. OH O B. R group O C. Amino Hydrogen O D. Carboxyl Hydrogen 37

Why are water and its derivatives useful as buffers in the cell cytoplasm?   A. H3O+ can serve as a strong base.   B. H2O can make hydrogen bonds.   C. H20 can serve as a strong acid and as a strong base.   D. H20 can serve as a weak acid and OH- can serve as a weak base.   E. H20 can serve as a weak base and as a weak acid.

In the presence of water, nonpolar associations form between molecules or regions of molecules that are ____.   A. partially charged   B. hydrophobic   C. hydrophilic   D. hydrophobic and hydrophilic

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Which of the following are not driving forces for protein folding? Salt Bridges Conformational Entropy Entropy of the Solvent Internal Hydrogen Bonding Disulfide Bonds i. ii. iii. iv. V. O i, iii, iv O ii, iii, iv, v O ii, v Oi, v Oi, iv