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Biology 172 - Final > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

Which part of this enzyme is the X pointing towards?

A

The active site

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2
Q

What type of molecule is Y?

A

Allosteric inhibitor

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3
Q

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

A

Noncovalent chemical bonds between our groups have rearranged

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4
Q

Which of the molecule shown is the monomer of nucleic acid

A

D

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5
Q

Which of the molecules can form glycosidic linkage?

A

B

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6
Q

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

A

A, B, and C

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7
Q

A micelle is made up of which of the molecules?

A

E

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8
Q

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

A

A and C

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9
Q

The molecule shown here is made up of -

A

Nucleotides that include the sugar, ribose

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10
Q

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

A

Phosphodiester bond

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11
Q

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

A

U

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12
Q

How does a cell use the template strand of DNA

A
  • 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
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13
Q

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

A

The nitrogenous base

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14
Q

Complementary base pairing occurs when -

A
  • Hydrogen bonds form between nitrogenous bases
  • Two strands of nucleic acids are anti-parallel
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15
Q

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

A

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

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16
Q

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

A
  • To provide genetic information for all the cells in an organism
  • To provide genetic information for the offspring of an individual
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17
Q

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

A

B

18
Q

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

A

DNA polymerase III

19
Q

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

A

Helicase

20
Q

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

A

5’ to 3’

21
Q

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

A

A

22
Q

What is the role of DNA polymerase I?

A

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

23
Q

A nucleosome is made up of -

A
  • a collection of histone proteins
  • DNA
24
Q

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

A

1.2*10^-7 mol/s

25
Q

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

A

the active site of the enzyme is becoming saturated

26
Q

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

A

Transport of molecules across a phospholipid bilayer

27
Q

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

A

An ion

28
Q

Which part of this membrane is responsible for selective permeability?

A

H

29
Q

Which of the structures represents an integral membrane protein?

A

B

30
Q

Which part of this drawing represents carbohydrates?

A

A

31
Q

Which part of this drawing represents hydrophobic region?

A

C & H

32
Q

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

A
  • 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
33
Q

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

A

Osmosis; into

34
Q

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

A

Quaternary

35
Q

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

A

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

36
Q

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

A

Between 30 and 40A

37
Q

Which relative position of Aquaporin is most hydrophobic?

A

Between 30 and 40A

38
Q

Aquaporin is an example of which type of transport protein?

A

channel

39
Q

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

A
  • Hydrogen bonds
  • Disulfide bonds
  • Ionic bonds
40
Q

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

A

B

41
Q
A

Biology 172 - Final (3 decks)

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