PRAC EXAM 2

Question 1

Properties of an object that are only revealed at higher orders of interaction of that object are called?

Answer 1

emergent

Question 2

Unequal sharing of electrons between atoms leads to which type of covalent bond and which types of noncovalent bond?

Answer 2

polar-hydrogen bonding

Question 3

If the sum of noncovalent interactions between two aligned molecules is increased, what will happen to a close alignment between those two molecules?

Answer 3

the duration of alignment will increase

Question 4

To replace a hydrogen with van der Waal’s interactions will require approx. how many interactions in order to maintain the same strength of noncovalent bonds?

Answer 4

ten

Question 5

Which bond requires the least amount of heat energy to be broken?

Answer 5

van der Waal’s interaction

Question 6

Which amino acids would be used to make a polypeptide that would interact easily with the fatty acid tails of a membrane?

Answer 6

nonpolar

Question 7

The formation of an alpha-helix or a beta-sheet structure in a polypeptide describes which level of protein structure?

Answer 7

secondary

Question 8

An elemental analysis of the macromolecular class of proteins will have which of the following?

Answer 8

CHNO with some S atoms

Question 9

A covalent bond is broken in a macromolecule and an amino acid is released. Which type of bond was broken?

Answer 9

peptide

Question 10

A mixture of this macromolecular class extracted from cells disperses completely in water and is unaffected by changes in pH and does not move in an electrical field. Which of the following macromolecules was described?

Answer 10

polysaccharides

Question 11

The membrane that forms around an oil droplet suspended in water will be a -

Answer 11

monolayer

Question 12

You have a summer job at the horticulture greenhouses and a shipment of unlabeled mysterious plant arrives. You cannot identify them but the fatty acid analysis shows a large amount of short-chained unsaturated fatty acids. You decide to place them where?

Answer 12

outside in the open air

Question 13

A membrane has a coupled transporter that is an antiporter for ATP and ADP. Using the relationship of certain metabolites with particular metabolic pathways, which cellular membrane is involved?

Answer 13

mitochondrion

Question 14

A molecule diffuses very rapidly across a physical membrane. Select its most likely physic-chemical properties.

Answer 14

small, nonpolar

Question 15

Considering the ability of molecules to diffuse across a physical membrane based on physicochemical properties, would you expect a plasma membrane transporter for a carbon dioxide molecule?

Answer 15

no

Question 16

Which organelle has a transport mechanism involving a polypeptide that begins with one signal sequence and can end with another signal sequence?

Answer 16

endoplasmic reticulum

Question 17

Which organelle transport has a soluble receptor that interacts with a polypeptide being made?

Answer 17

endoplasmic reticulum

Question 18

Which organelle imports proteins one at a time but can then transport proteins in bulk to another organelle?

Answer 18

endoplasmic reticulum

Question 19

A vesicle fusing with the plasma membrane is involved with

Answer 19

exocytosis

Question 20

Vesicles forming at the plasma membrane with no visible cargo are involved in

Answer 20

pinocytosis

Question 21

Vesicles fusing around a peroxisome are involved with

Answer 21

autophagy