Exam 2

Question 1

Which part of this enzyme is the X pointing towards?

Answer 1

The active site

Question 2

What type of molecule is Y?

Answer 2

Allosteric inhibitor

Question 3

Look closely at the enzyme in image 1 and the enzyme in image 2. What statement can describing the difference?

Answer 3

Noncovalent chemical bonds between our groups have rearranged

Question 4

Which of the molecule shown is the monomer of nucleic acid

Answer 4

D

Question 5

Which of the molecules can form glycosidic linkage?

Answer 5

B

Question 6

Which of the molecules could you find in the structure of a peptidoglycan cell wall?

Answer 6

A, B, and C

Question 7

A micelle is made up of which of the molecules?

Answer 7

E

Question 8

Which of the molecules could you find as part of an enzyme?

Answer 8

A and C

Question 9

The molecule shown here is made up of -

Answer 9

Nucleotides that include the sugar, ribose

Question 10

The single lines connecting the circles in this molecule represent which type of chemical bond?

Answer 10

Phosphodiester bond

Question 11

Which of the following nucleotide would you NOT find in a molecule of DNA?

Answer 11

U

Question 12

How does a cell use the template strand of DNA

Answer 12

• To direct the synthesis of RNA molecule
• To store information for the synthesis of proteins
• To direct the synthesis of a new molecule of DNA

Question 13

Which part of a nucleotide is most similar to the R group of amino acid?

Answer 13

The nitrogenous base

Question 14

Complementary base pairing occurs when -

Answer 14

• Hydrogen bonds form between nitrogenous bases
• Two strands of nucleic acids are anti-parallel

Question 15

The term semi conservative, refers to the fact that in DNA replication -

Answer 15

One strand of DNA is from the parent and the other newly synthesized

Question 16

Why is it important for a cell to be able to replicate its DNA?

Answer 16

• To provide genetic information for all the cells in an organism
• To provide genetic information for the offspring of an individual

Question 17

Which of the nucleic acid strands shown above would result following replication of the DNA strand shown in the box?

Answer 17

B

Question 18

The enzyme that catalyzes the synthesis of a new strand of DNA is -

Answer 18

DNA polymerase III

Question 19

The enzyme that catalyzes the unwinding of DNA at the origin of replication is -

Answer 19

Helicase

Question 20

DNA polymerase synthesizes a new DNA strand in the _____ direction.

Answer 20

5’ to 3’

Question 21

Predict which side of this DNA molecule will be the template for leading strand synthesis given the information provided in this diagram of replication fork

Answer 21

A

Question 22

What is the role of DNA polymerase I?

Answer 22

It fills in short DNA sequences after the RNA primers are removed

Question 23

A nucleosome is made up of -

Answer 23

• a collection of histone proteins
• DNA

Question 24

What is the approximate Vmax for the reaction shown by the fileed squares on this graph?

Answer 24

1.2*10^-7 mol/s

Question 25

The best explanation for the shape of the curve for the filled square is -

Answer 25

the active site of the enzyme is becoming saturated

Question 26

What of the following IS NOT a use of carbohydrates in a cell?

Answer 26

Transport of molecules across a phospholipid bilayer

Question 27

If the plasma membrane was made up of only phospholipids (no proteins) what molecule would NEVER make inside a cell?

Answer 27

An ion

Question 28

Which part of this membrane is responsible for selective permeability?

Answer 28

H

Question 29

Which of the structures represents an integral membrane protein?

Answer 29

B

Question 30

Which part of this drawing represents carbohydrates?

Answer 30

A

Question 31

Which part of this drawing represents hydrophobic region?

Answer 31

C & H

Question 32

What conditions must be present for movement of a solute to occur through a gated channel?

Answer 32

- A solute concentration gradient must be present - The conformation of the protein channel must be 'open' - The channel must have the correct specificity for the solute molecule

Question 33

Aquaporin is involved in the process of _____ where water molecules are moving _____ the cell in response to the high solute concentration in the cytoplasm.

Answer 33

Osmosis; into

Question 34

What is the highest level of protein structure found in a functional Aquaporin?

Answer 34

Quaternary

Question 35

What can you predict about the alpha helical portions of the Aquaporin protein shown here?

Answer 35

Some of the amino acids in the alpha helix will have polar R groups

Question 36

At what relative position is the pore at its narrowest diameter?

Answer 36

Between 30 and 40A

Question 37

Which relative position of Aquaporin is most hydrophobic?

Answer 37

Between 30 and 40A

Question 38

Aquaporin is an example of which type of transport protein?

Answer 38

channel

Question 39

What types of chemical bonds might be involved in connecting the individual Aquaporin proteins?

Answer 39

- Hydrogen bonds - Disulfide bonds - Ionic bonds

Question 40

Which of the following diagrams most closely represents the pore diameter of the protein shown in the graph?

Answer 40

B