Unit 1 - Moolecules

Question 1

How do R group interactions contribute to protein structure?

Answer 1

• By stabilizing beta pleated sheets in secondary structure
• Stabilizing further foldings of a polypeptide into a tertiary structure

Question 2

What allows the movement of water under tension in xylem?

Answer 2

Cohesion of water molecules due to hydrogen bonding

Question 3

What protein structure binds ALpha-helix and beta-pleated sheets chains together?

Answer 3

Quaternary

Question 4

Which property of water is not illustrated in a diagram of water molecules?

Answer 4

Adhesion

Question 5

Which molecules are produced during the hydrolysis of a triglyceride molecule?

Answer 5

Fatty acids and glycerol

Question 6

The hydrolysis of a pure sample of an organic molecule produces a pentose sugar, thymine, Guanine, and cytosine. What other substances could be expected to be present in the hydrolyzed sample?

Answer 6

Phosphate

Question 7

A molecule of DNA is found to contain 200 guanine bases, representing 25% of the total number of bases. How many phosphate groups does this molecule of DNA contain?

Answer 7

800

Question 8

Which feature of phospholipids give them their amphipathic properties?

Answer 8

Hydrophilic phosphate groups and hydrophobic fatty acids

Question 9

Which subunits would be connected by hydrogen bonds in a DNA molecule

Answer 9

Cytosine to guanine

Question 10

Where do hydrogen bonds come from?

Answer 10

Between the slight positive charge of hydrogen and slight negative charge of oxygen in different water molecules

Question 11

What is the benefit to living organisms that water has high specific heat capacity?

Answer 11

Aquatic environments do not have a great fluctuation in their temp

Question 12

Which property of DNA explains how genetic info can be replicated accurately?

Answer 12

complimentary base pairing

Question 13

Which property of water makes it possible for insects that have areas of their legs covered with a hydrophobic substance to walk on surface of water?

Answer 13

Cohesion of water molecules

Question 14

What does primary structure of proteins do?

Answer 14

The sequence of amino acids linked together to form a polypeptide chain

Question 15

What does secondary structure of proteins do?

Answer 15

Folds proteins into shapes like alpha helix and beta pleated sheets

Question 16

What does tertiary structure of proteins do?

Answer 16

The overall 3d shape of whole protein

Question 17

What does quaternary structure of proteins do?

Answer 17

Arrangements of multiple protein chains or subunits held together by hydrogen bonds to form functional protein