Biochemistry MSE
.
- 1.
Would you expect to see this H-bond in nature?
- 2.
Which of these interactions between these water molecules are H bonds?
- 3.
Would you expect to see this H-bond in nature?What is/are the functional group/s?
- 4.
Which of these interactions between compounds are H bonds?What is/are the functional group/s?
- 5.
The maximum size of the cell is limited by
- A.
Its need for enough surface area for exchange with its environment
- B.
The number of organelles that can be packed inside
- C.
The materials needed to build it
- D.
The amount of flexibility it needs to move
- E.
The amount of food it needs to survive
Correct Answer
A. Its need for enough surface area for exchange with its environment -
- 6.
Scientists announce that they have discovered single celled life on one of the moons of Saturn, and that its biochemistry resembles life on earth. Would the organism be more likely to
- A.
Have ribosomes
- B.
Be a member of the Bacteria
- C.
Be a member of the Archaea
- D.
Be a eukaryote
- E.
Be photosynthetic
Correct Answer
A. Have ribosomesExplanation
(All life on earth has ribosomes: it is the primitive state. If alien life resembles that on earth, we would expect to find ribosomes)Rate this question:
-
- 7.
Choose the most appropriate answer. The majority of cellular lipids in bacteria are found in:
- A.
The cytoplasm
- B.
Membranes
- C.
Glycogen
- D.
Metabolic pathways
- E.
The nucleoid
Correct Answer
B. Membranes -
- 8.
Which are not both major classes of biomolecules in living cells?
- A.
RNA and DNA
- B.
Lipids and metal ions
- C.
Polysaccharides and nucleic acids
- D.
Oligonucleotides and peptides
- E.
Amino acids and RNA
Correct Answer
B. Lipids and metal ions -
- 9.
To enter or leave a cell, a substance must pass through
- A.
A microtubule
- B.
A Golgi complex
- C.
A ribosome
- D.
The cell wall
- E.
The plasma membrane
Correct Answer
E. The plasma membraneExplanation
The plasma membrane is the outer barrier of the cell, defining “in/out”Rate this question:
-
- 10.
Bacterial cells, being prokaryotic, are by comparison to a eukaryotic cell
- A.
Generally smaller
- B.
Have a smaller nucleus
- C.
Lack a plasma membrane
- D.
Lack a cell envelope
- E.
Have a greater variety of organelles
Correct Answer
A. Generally smallerExplanation
Bacteria have no nucleus or other organelles, but do have a plasm membrane. As for what a cell envelope is, it is not a technical term.Rate this question:
-
- 11.
You would expect a cell with an extensive Rough Endoplasmic Reticulum and large Golgi Apparatus to
- A.
Exhibit high rates of protein degradation
- B.
Secrete a lot of protein
- C.
Move actively
- D.
Perform photosynthesis
- E.
Store lots of food
Correct Answer
B. Secrete a lot of protein -
- 12.
Which of the following matches the organelle with its function?
- A.
Mitochondrion…sugar synthesis
- B.
Nucleus…cellular respiration
- C.
Ribosome…manufacture of lipids
- D.
Lysosome…movement
- E.
Endoplasmic reticulum…protein synthesis
Correct Answer
E. Endoplasmic reticulum…protein synthesis -
- 13.
A research student identifies a protein made by the ER and used in the plasma membrane but the protein in the plasma membrane is slightly different than in the ER. The protein was probably modified in the:
- A.
Golgi
- B.
Peroxisome
- C.
Ribosome
- D.
Nucleus
- E.
Lysosome
Correct Answer
A. Golgi -
- 14.
Which clue tells you whether a cell is prokaryotic or eukaryotic?
- A.
Presence of a rigid cell wall
- B.
Presence of internal membranes
- C.
Presence of ribosomes
- D.
Whether or not the cell carries out metabolism
- E.
Whether or not the cell contains DNA
Correct Answer
B. Presence of internal membranesExplanation
Internal membranes delimit membrane bound organelles, a property of EukaryotesRate this question:
-
- 15.
A eukaryotic cell was grown in a tube containing radioactive nucleotides. Examination of the cell showed that the radioactivity was mainly concentrated in:
- A.
Rough ER
- B.
Peroxisome
- C.
Smooth ER
- D.
Mitochondria
- E.
Nucleus
Correct Answer
E. Nucleus -
- 16.
The functional groups of chemical compounds have particular functions. Which of the following functions are incorrect?
- A.
Ethyl; hydrophilic
- B.
Hydroxyl; hydrophilic
- C.
Sulfhydryl; H bonding
Correct Answer
A. Ethyl; hydrophilic -
- 17.
The functional groups of chemical compounds have particular functions. Which of the following functions are incorrect?
- A.
Phosphoryl; acidic, negatively charged
- B.
Ester; acidic, hydrophobic
- C.
Protonated amino; Basic, H bonding
Correct Answer
B. Ester; acidic, hydrophobic -
- 18.
Which is the most appropriate example of a monomer polymer relationship?
- A.
Nucleotides and starch
- B.
Fatty acids and adipose fat (triglycerides)
- C.
Glucose and glycogen
- D.
Oligonucleotides and peptides
- E.
Amino acids and RNA
Correct Answer
C. Glucose and glycogen -
- 19.
Which is not an example of a correct monomer polymer relationship?
- A.
Uracil and RNA
- B.
Adenine and DNA
- C.
Serine and polypeptide
- D.
Glucose and starch
- E.
Ribose and glycogen
Correct Answer
E. Ribose and glycogen -
- 20.
The nucleotides Adenine, Thymine, Cytosine, and Guanine are components of what polymer?
- A.
RNA
- B.
DNA
- C.
Triglyceride
- D.
Protein
- E.
None of the above
Correct Answer
B. DNA -
- 21.
Which of these interactions between compounds are H bonds?
- A.
Dotted lines
- B.
Double lines
- C.
Single lines
- D.
Squiggly lines
Correct Answer
A. Dotted lines -
- 22.
Which of the folowing features is shared by both prokaryotic and eukaryotic cells?
- A.
Peroxisomes
- B.
Nuclues
- C.
Endoplasmic reticular membrane
- D.
Cytoplasmic membrane
- E.
Cytoplasmic plasmid
Correct Answer
D. Cytoplasmic membrane -
- 23.
Each structure in a eukaryotic animal cell has a particular function. The following is a description of the roles of these different structures. which one is NOT correct?
- A.
Plasma membranes- regulates movement of materials into and out of the cell
- B.
Nucleolus - contains all of the cell's genes on chromosomes
- C.
Mitochondrion - oxidises metabolities to produce ATP
- D.
Transport vesicles - shuttle membranes and proteins between cellular organelles and membranes
- E.
Lysosome - degraded intracellular debris
Correct Answer
B. Nucleolus - contains all of the cell's genes on chromosomes -
- 24.
Which of the following statements is untrue?
- A.
Lipids are components of all cells
- B.
All viable bacterial cells have DNA
- C.
All mammalian cells contain carbohydrates
- D.
Some bacteria do not ever require ribosomes
- E.
All cells utilise ATP as an enery source
Correct Answer
D. Some bacteria do not ever require ribosomes -
- 25.
The partial change separation in H2O results from:
- A.
Attraction of electrons by the nucleus of the hydrogen atom
- B.
Oxygen's lower electronegativity
- C.
A less dense electron cloud near the nucleus of the oxygen atom
- D.
A net attraction of positively charged electrons to the nucleus of the H atoms
- E.
None of the above
Correct Answer
E. None of the above -
- 26.
The nitrogen atom:
- A.
Has a completely filled outer energy level
- B.
Can form just one double covalent bond or two single covalent bonds
- C.
Does not react with any other atom
- D.
Has a partial negative dipole charge in molecules of the formula H2N-R
- E.
Can interact with maximally two separate other atoms
Correct Answer
D. Has a partial negative dipole charge in molecules of the formula H2N-R -
- 27.
How many H-bonds does the average water molecules make at any instant in liquid water at 25oC?
- A.
2.0
- B.
2.4
- C.
3.0
- D.
3.4
- E.
4.0
Correct Answer
D. 3.4 -
- 28.
Which statement is correct?
- A.
Nucleic acids are essentially polymers of acidic sugars found in the nucleus
- B.
Lipids are characterised by their hydrophobic nature
- C.
Amphipathic molecules have absolutely no affinity for water
- D.
Amphiphilic molecules are essentially synonymous with lipids
- E.
All of the above are incorrect
Correct Answer
B. Lipids are characterised by their hydrophobic nature -
- 29.
Which statement would best the term 'residue' in biochemical reactions
- A.
Lipid residues left dried on a reaction vessel after boiling and evaporation
- B.
The residual monomeric product of the hydrolysis of a bioploymer
- C.
Hydrophobic interactions that expel water to generate the residue
- D.
The repeating constitutive components of biopolymers
- E.
The stereochemical equivalent of ortho-isomeric residuals
Correct Answer
D. The repeating constitutive components of biopolymers -
- 30.
In an aqueous solution of 1M NaOH, the pH of the solution is:
- A.
0
- B.
1.14
- C.
7
- D.
10
- E.
14
Correct Answer
E. 14 -
- 31.
What is the concentration of H+ in a solution in which the OH- concentration is 0.00025 (2.5x10-4) M?
- A.
2.5x10-10M
- B.
2.5x10-18M
- C.
4x10-10M
- D.
4x10-11M
- E.
None of the above
Correct Answer
D. 4x10-11M -
- 32.
The pH of a solution is given by
- A.
PKa/p[OH-]
- B.
Log[H+]
- C.
Ln([H+][OH-]/[H2O]
- D.
Titrating in NaOH until you reach the pKa
- E.
None of the above
Correct Answer
E. None of the above -
- 33.
Butanol varies at 117oC, whereas butane vaporises at
- A.
Butanol has a less efficient van der Waals network
- B.
Butane's hydrophobic interactions are better at keeping liquid
- C.
Butanol is heavier, which is why it can't evaporate
- D.
H-bonding by butanol elevates its boiling point
- E.
A total lack of polar or ionic interactions
Correct Answer
D. H-bonding by butanol elevates its boiling point -
- 34.
Which of the following features is not common to all cells
- A.
Chromosome
- B.
Plasma membrane
- C.
DNA polymerase
- D.
Ribosomes
- E.
Lysosomes
Correct Answer
E. Lysosomes -
- 35.
A biomolecule contains the following functional group. Which term most accurately describes this functional group?
- A.
Anhydride
- B.
Disulfide
- C.
Mixed anhydride
- D.
Sulfhydryl
- E.
Thioester
Correct Answer
A. Anhydride -
- 36.
Nitrogenous bases and 5 carbon ribose sugars are monomeric building blocks for which class of biological entity?
- A.
Proteins
- B.
Caarbohydrates
- C.
Nucleic acids
- D.
Glycoproteins
- E.
Plasma membranes
Correct Answer
C. Nucleic acids -
- 37.
The figure shows a schematic depiction of a carbon atom. The bond angle between adjacent tetrahedrally oriented bonds defined by "X?" in the figure is:
- A.
45
- B.
60
- C.
75
- D.
109.5
- E.
135.6
- F.
135.6
Correct Answer
D. 109.5 -
- 38.
Ribosomes
- A.
Synthesise proteins in cells from all organisms on Earth
- B.
Transport lipids to the Golgi Apparatus
- C.
Are the sites of ribose biogenesis
- D.
Are primarily involved in bacterial mating
- E.
Are named for their red colour under the light microscope
Correct Answer
A. Synthesise proteins in cells from all organisms on Earth -
- 39.
Of the following biomolecules, which is a polymer?
- A.
Hexose sugar
- B.
Amino acids
- C.
Nitrogenous base
- D.
Cholesterol
- E.
Peptide
Correct Answer
E. Peptide -
- 40.
What is the maximum number of hydrogen bonds that a water molecule can make
- A.
1
- B.
2
- C.
3
- D.
4
- E.
5
Correct Answer
D. 4 -
- 41.
Hydrogen bonds are
- A.
Stronger and longer than covalent bonds
- B.
Stronger and shorter than covalent bonds
- C.
Longer and weaker than covalent bonds
- D.
Weaker and shorter than covalent bonds
- E.
The same as covalent bonds
Correct Answer
C. Longer and weaker than covalent bonds -
- 42.
Which of the following will have the lowest boiling point?
- A.
Methane (CH4)
- B.
Methanol (CH3OH)
- C.
Ethane (H3CCH3)
- D.
Ethanol (H3CCH2OH)
- E.
Propane (H3CCH2CH3)
Correct Answer
A. Methane (CH4) -
- 43.
Oil and water mixtures tend to separate because
- A.
The oil is thicker than the water
- B.
The separation maximises the entropy of the system
- C.
Oil is greasy
- D.
Oil is generally more dense than water so oil sinks
- E.
Water freezes and oil doesn't
Correct Answer
B. The separation maximises the entropy of the system -
- 44.
0.5 Molar solution of hydrochloric acid will have a pH to one decimal point of
- A.
0.5
- B.
-0.5
- C.
0.3
- D.
-0.3
- E.
1x10(-14)
Correct Answer
C. 0.3 -
- 45.
The pH of a 500ml 0.2M solution of Acetic acid (pKa 4.46) combined with 500ml of 0.2M sodium acetate is:
- A.
0.2
- B.
0.4
- C.
3.76
- D.
4.46
- E.
0.1
Correct Answer
D. 4.46 -
- 46.
Which of the following statements about the amino acid glycine is false?
- A.
In an aqueous solution pH 3 glycine has a net positive charge
- B.
In an aqueous solution pH 7 glycine has no net charge
- C.
In an aqueous solution pH 10 glycine has a net negative charge
- D.
The side group or R group is a H atom
- E.
Glycine always exists as wither D or L stereoisomers
Correct Answer
E. Glycine always exists as wither D or L stereoisomers -
- 47.
Which of the following amino acids have side chain R groups with positive charge at neutral pH?
- A.
Arginine and lysine
- B.
Arginine and serine
- C.
Serine and threonine
- D.
Tyrosine and lysine
- E.
Histidine and glycine
Correct Answer
A. Arginine and lysine -
- 48.
Which of the following amino acids has a side chain that cannot hydrogen bond?
- A.
Serine
- B.
Threonine
- C.
Isoleucine
- D.
Arginine
- E.
Tyrosine
Correct Answer
C. Isoleucine -
- 49.
How many pKa values does the amino acid phenylalanine have
- A.
0
- B.
1
- C.
2
- D.
3
- E.
4
Correct Answer
C. 2 -
- 50.
Table 3.1 in the appendix provides the pKa values for amino acids. Assuming that they have equal molarities, which of the following would provide the greatest buffering power in an aqueous environment where the pH was 2.9?
- A.
Tyrosine
- B.
Cysteine
- C.
Lysine
- D.
Aspartate
- E.
Histidine
Correct Answer
D. Aspartate -
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