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Protein Structure Pt. 1

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Structural Basis for Biological Function (Basics) Quiz on Protein Structure Pt. 1, created by gina_evans0312 on 21/09/2013.
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Quiz by gina_evans0312, updated more than 1 year ago
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Created by gina_evans0312 over 11 years ago
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Question 1

Question
Which type of protein is conjugated?
Answer
  • One that contains only amino acid residues
  • One that contains prosthetic groups
  • One that is bound to a membrane

Question 2

Question
Which of the following means a protein with two identical subunits?
Answer
  • Heteromultimer
  • Homomonomer
  • Homomultimer

Question 3

Question
Which of the following proteins types tend to have various roles, as opposed to a single, defined one?
Answer
  • Fibrous
  • Globular
  • Membrane

Question 4

Question
Which of the following tend not to be water soluble?
Answer
  • Fibrous
  • Globular
  • Membrane spanning

Question 5

Question
What secondary structures tend to make up fibrous proteins?
Answer
  • Long strands
  • Long sheets
  • Short strands

Question 6

Question
What is specific about the membrane spanning part of membrane proteins?
Answer
  • They are hydrophobic
  • They are hydrophillic

Question 7

Question
Define 'Domain' in reference to protein structure
Answer
  • Independent folding units of the tertiary structure that have independent functions
  • Independent folding units of tertiary structure that have related functions
  • Dependent folding units of secondary structure that have relation functions
  • Dependent folding units of tertiary structure that have related functions

Question 8

Question
Define subunit
Answer
  • Independent structures in a quaternary structure
  • Independent structures in a tertiary structure
  • Dependent subunits in a quaternary structure

Question 9

Question
What can be the result of a single amino acid mutation in collagen?
Answer
  • Osteoarthritis
  • Osteogenesis imperfecta
  • Osteocalcification

Question 10

Question
What is Resonance (as pertaining to protein structure)?
Answer
  • Where bond pairs cannot be described as a single Lewis Diagram
  • Where two atoms in separate molecules cause each other to vibrate
  • Where two atoms in separate molecules are more likely to bond to each other than to another atom

Question 11

Question
Which is the psi bond?
Answer
  • Between the carbonyl carbon and the alpha carbon
  • Between the alpha carbon and the amide group
  • Between the alpha carbon and the R group

Question 12

Question
Which is the phi bond?
Answer
  • Between the alpha carbon and the amide group
  • Between the alpha carbon and the carbonyl carbon
  • Between the alpha carbon and the R group

Question 13

Question
What is Steric clashing?
Answer
  • Where the charge of an atom prevents it from being close to another
  • Where the electron arrangement of an atom prevents it from being close to another
  • Where the size of an atom prevents it from being close to another

Question 14

Question
Why is a peptide bond planar?
Answer
  • It has a double bond like structure
  • It's electrons clash with that of the psi bond
  • It's electrons clash with the phi bond

Question 15

Question
How many residues per turn in an alpha helix?
Answer
  • 3.4
  • 3.5
  • 3.6

Question 16

Question
How much does an alpha helix rise per aa?
Answer
  • 1.5 angstroms
  • 1.6 angstroms
  • 1.7 angstroms

Question 17

Question
Alpha helices are stabilised by hydrogen bonding with what groups?
Answer
  • Carbonyl oxygen 4 amino acids away
  • Carbonyl oxygen 6 amino acids away
  • Carbonyl oxygen 8 amino acids away

Question 18

Question
The stabilising effect of the hydrogen bonds makes a loop of how many atoms?
Answer
  • 12
  • 13
  • 14

Question 19

Question
Which of the following destabilize an alpha helix?
Answer
  • Glycine
  • Proline
  • Leucine
  • Glutamic acid

Question 20

Question
Beta sheets rise by 3.47A per residue in anti-parallel sheets
Answer
  • True
  • False

Question 21

Question
In parallel sheets, there is a rise of .... per residue
Answer
  • 3.25A
  • 4.25A
  • 2.25A

Question 22

Question
3 residues per turn of the strand are pictured as a helix
Answer
  • True
  • False

Question 23

Question
Anti-parallel strands are _ stable than parallel ones
Answer
  • More
  • Less

Question 24

Question
Side chains all point the same way (in the plane of the sheet)
Answer
  • True
  • False

Question 25

Question
What is the role of loops?
Answer
  • Connecting alpha and beta sheets
  • Connecting alpha helices and alpha helices
  • Connecting beta sheets and beta sheets

Question 26

Question
Loops contain mostly hydrophillic residues & are found on the protein surface
Answer
  • True
  • False

Question 27

Question
What is the role of beta turns?
Answer
  • To allow beta sheets to reverse direction
  • To connect beta sheets together
  • To link protein subunits together

Question 28

Question
What two amino acids cannot be contained within a beta sheet?
Answer
  • Proline
  • Argenine
  • Glycine
  • Valine

Question 29

Question
Beta turns link the oxygen of the carbonyl group and the hydrogen of the nitrile group 4 residues away
Image:
Beta_Turns (image/jpg)
Answer
  • True
  • False

Question 30

Question
Levinthals Paradox- if a protein folded by trying each fold in a sequence, it would take an impossibly long time to fold correctly. Therefore, protein folding cannot be random or sequential
Answer
  • True
  • False

Question 31

Question
What is this?
Image:
Free_Energy_Change (image/png)
Answer
  • The energy change as proteins fold
  • Gibbs free energy
  • Entropy change

Question 32

Question
Why are the internal interactions of protein folding unfavorable?
Answer
  • It decreases entropy
  • They're hydrophobic in a hydrophillic environment
  • They prevent the protein from folding correctly

Question 33

Question
Non-covalent and hydrophobic effects (which effects free water) decrease enthalpy
Answer
  • True
  • False

Question 34

Question
Change in energy during folding = Internal interactions - (Hydrophobic effect + conformational entropy)
Answer
  • True
  • False

Question 35

Question
Proteins fold towards configurations with the...
Answer
  • lowest energy
  • Highest energy
  • Easiest energy to reach (energy closest to that of unfolded protein)

Question 36

Question
What can slow the progress of protein folding?
Answer
  • A local low energy minimum
  • A local high energy minimum

Question 37

Question
What is nucleation?
Answer
  • Reversible secondary structure formation
  • Reversible tertiary structure formation
  • Reversible quaternary structure formation

Question 38

Question
Which of the following happens after nucleation?
Answer
  • The secondary structure aggregation forms a molten globular intermediate
  • Domains adjust to the lowest energy form

Question 39

Question
The protein is capable of conformational change after forming
Answer
  • True
  • False
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