o 201 e2 Flashcards
1. Which of the following bonds/interactions are responsible for the primary structure of polypeptides? A. Van Der Waals B. Ionic interactions C. H-bonds D. Covalent Bonds
D. Covalent Bonds
2. The linear sequences in DNA encode proteins. Which is involved in producing 3D structures? A. Ionic interactions & H-bonds B. Covalent interactions & H-bonds C. Ionic & covalent interactions D. All of the above
D. All of the above
3. You are running a marathon. You sweat profusely so you drink a lot of fluid during your run. What property of water allows you to continue running without developing hyperthermia? A. Presence of H bonds B. Small degree of ionization C. Polarity D. High dielectric constant
A. Presence of H bonds
- In an aqueous environment, hydrophobic portions of biomolecules preferentially cluster at the center, away from the water molecules. Which of the following does not illustrate this principle?
A. Serine at the outer surface of the plasma membrane
B. Purine at the center of double stranded DNA
C. Phosphate groups at the outer region of the bilipid layer
D. Sialic residues at the outer surface of the cellular membrane
B. Purine at the center of double stranded DNA
5. Which of the following best describes the relationship between cyclohexane and 1-hexene? A. Functional isomer B. Positional isomer C. Enantiomer D. Tautomer
A. Functional isomer
6. What is/are the functional groups of cysteine? A. Sulfhydryl group B. Amino group C. Carboxylic group D. All of the above
A. Sulfhydryl group
7. Hormones like insulin are commonly transported by means of vacuolar transport. Of the following configurations of phospholipids, which is the most relevant in this form of transport? A. Micelle B. Monolayer C. Bilayer D. A & C
C. Bilayer
Number 8: A. Non-polar (hydrophobic) amino acid B. Hydrophilic uncharged amino acid C. Positively charged amino acid D. Negatively charged amino acid
https://docs.google.com/document/d/1xPGEvvii92XcfBpTed3OTl5oCZT26gSXFbJc2BBCUjc/edit?usp=sharing
A. Non-polar (hydrophobic) amino acid
Number 9: A. Non-polar (hydrophobic) amino acid B. Hydrophilic uncharged amino acid C. Positively charged amino acid D. Negatively charged amino acid
https://docs.google.com/document/d/1xPGEvvii92XcfBpTed3OTl5oCZT26gSXFbJc2BBCUjc/edit?usp=sharing
B. Hydrophilic uncharged amino acid
Number 10: A. Non-polar (hydrophobic) amino acid B. Hydrophilic uncharged amino acid C. Positively charged amino acid D. Negatively charged amino acid
https://docs.google.com/document/d/1xPGEvvii92XcfBpTed3OTl5oCZT26gSXFbJc2BBCUjc/edit?usp=sharing
A. Non-polar (hydrophobic) amino acid
11. What level of protein organization is shown in Frame A? A. Primary B. Secondary C. Tertiary D. Quaternary
https://docs.google.com/document/d/1xPGEvvii92XcfBpTed3OTl5oCZT26gSXFbJc2BBCUjc/edit?usp=sharing
D. Quaternary
12. What stabilizes the secondary level of protein structure? (Frame C) A. Peptide B. Hydrogen bond C. Ionic bond D. Hydrophobic interaction
B. Hydrogen bond
13. Which is a cyclic amino acid that provides rigidity in the polypeptide? A. Serine B. Proline C. Alanine D. Glycine
B. Proline
- Which of the following biological processes follow/s the laws of thermodynamics
A. The energy of glucose is converted to ATP in glycolysis
B. Contraction of muscle after ATP hydrolysis
C. Maintenance of core body temperature
D. All of the above
D. All of the above
- Which of the following statements regarding beta-keratin is FALSE?
A. Assumes a “beta-pleated sheet” (zigzag) configuration
B. All hydrogen bonds are inter-chain rather than intrachain.
C. Flexible, non-stretchable and insoluble in water.
D. Oriented in parallel direction for stability.
E. R groups are small and non-polar.
D. Oriented in parallel direction for stability
- Which of the following transport processes are greatly affected by the fluctuations in ATP-ADP concentrations?
A. Transport of small to medium chain fatty acids across the membrane
B. Transport of oxygen across the membrane
C. Movement of water through aquaporins
D. Transport of Na+ and glucose across the membrane
D. Transport of Na+ and glucose across the membrane
- What happen to the reactants and products of a reaction with a free energy of zero?
A. No significant change occurs in the forward and reverse reactions.
B. The concentration of reactants is greater than the products.
C. The concentration of products is greater than the reactants.
D. The concentrations of the reactants and products are equal.
A. No significant change occurs in the forward and reverse reactions.
18. Which of the following reaction characteristics CANNOT be determined through bioenergetics? A. Rate of reaction B. Spontaneity of reaction C. Direction of reaction D. Heat contributed to surroundings
A. Rate of reaction
- Which of the following statements does NOT describe why the deltaG from the hydrolases of ATP is large and negative?
A. Electrostatic repulsion among the negatively charged oxygen atoms
B. Better solvation of the products of ATP hydrolases compared to ATP
C. Resonance stabilization of the products of ATP hydrolases
D. Hydrophobic interaction among the triphosphate moieties
D. Hydrophobic interaction among the triphosphate moieties
- Which of the following about entropy is/are true?
A. A reaction is spontaneous if its change in entropy is negative.
B. Entropy is the randomness or disorder in a system.
C. To maintain order within a cell, entropy is decreased in its surroundings.
D. Only B and C are correct.
B. Entropy is the randomness or disorder in a system.
21. Which of the following conditions will be required for biochemical reactions to proceed under an enzyme free system? A. Large cells B. High temperature C. Large proteins D. Small atoms
B. High temperature
22. Which of the following classes of enzymes does not mediate group transfer reactions? A. Hydrolase B. Oxidoreductase C. Isomerase D. Transferase
A. Hydrolase
23. What is a component of a functional enzyme? A. Apoenzyme B. Substrate C. Prosthetic Group D. Active Site
D. Active Site
24. Which of the following enzymes is not a typical indicator of myocardial infarction? A. SGOT, SGPT B. Amylase C. Creatinine phosphokinase D. Lactic dehydrogenase
B. Amylase
- Azidodeoxythymidine (AZT) is an inhibitor that conjugates with the HIV reverse tanscriptase’s substrates for the active site. Which of the following statements about this type of inhibitor molecule is CORRECT?
A. The inhibitor has the same shape as the product
B. The inhibitor is a nucleoside analog
C. The inhibitor is an endogenous substrate
D. The compound binds to the allosteric site
B. The inhibitor is a nucleoside analog
26. The following exhibit proteolytic activity EXCEPT: A. Urokinase B. Fructokinase C. Streptokinase D. Caspase
C. Streptokinase
27. Which of the following molecules is present in the most reduced state? A. Amino Acid B. Glucose C. Fatty acid D. Nucleic Acid
C. Fatty acid
28. Which of the following classes of of lipids is responsible for the cell recognition site in the plasma membrane? A. Phospholipid B. Sphingolipid C. Cerebroside D. Ganglioside
D. Ganglioside
- Which of the following is true regarding the lipid composition of the plasma membrane?
A. Phospholipid>Sphingolipid>Cholesterol
B. Phospholipid>Sphingolipid>Cholesterol Ester
C. Sphingolipid>Phospholipid>Cholesterol
D. Sphingolipid>Phospholipid>Cholesterol Ester
A. Phospholipid>Sphingolipid>Cholesterol
30. Which of the following poly-unsaturated fatty acids is the precursor of the informational medium present in the cell membrane? A. Oleic Acid B. Linoleic Acid C. Arachidonic Acid D. Alpha-Linoleic Acid
C. Arachidonic Acid
31. Which of the following analogous pairs about alcohol backbone of corresponding type of lipid is incorrect? A. Glycerol : Lecithin B. Sphingosine : Ganglioside C. Ceramide : Sphingomyelin D. Sphingosine : Galactocerebroside
C. Ceramide : Sphingomyelin
- Which of the following statements about the cell membrane is CORRECT?
A. The outer and inner leaflets exhibit symmetry
B. Lipid rafts are rich in phospholipids cholesterol
C. Cell membrane assembly is stabilised by covalent bonds
D. Cell membrane appears trilamellar under electron microscope
D. Cell membrane appears trilamellar under electron microscope
- Which of the following statements about cholesterol ester is incorrect?
A. It is a neutral lipid
B. It is found in cell membranes where it regulates fluidity
C. It is excreted as bile salts
B. It is found in cell membranes where it regulates fluidity
34. Which of the following lipid configurations is most associated with lipid digestion? A. Micelle B. Hemicaps C. Bilayer D. Monolayer
A. Micelle
- Which best describes fats as energy sources?
A. Fats are poor energy sources because they
B. They are not reliable sources of energy because they have low mobility
C. Fats are good energy sources for their molecular weight because they are the least oxidized molecules
D. Fats are preferred sources of energy because they are readily convertible into glucose
C. Fats are good energy sources for their molecular weight because they are the least oxidized molecules