Biochemistry MCQs

Biochemistry MCQs

Answer these 100+ Biochemistry MCQs and see how sharp is your knowledge of Biochemistry. Scroll down and let's start!

1: ______ is a steroid.

A.   Butter

B.   Sucrose

C.   Amino acid

D.   Estrogen

2: A peptide bond binds _____.

A.   Polymer ... glucose molecules

B.   A nucleotide is to a nucleic acid

C.   They are large polymers.

D.   Amino acids together in a protein

E.   Maltose + water ... dehydration synthesis

3: An extremely efficient enzyme has a _____ km and a _____ kcat.

A.   Small; small

B.   Small; large

C.   Large; large

D.   Large; small

4: Atoms from the amino acids _____ are utilized in purine biosynthesis.

A.   Gln, Asp

B.   Gln, Asp, Gly

C.   Gly, Asp

D.   Gln, Asp, Gly, Phe

E.   None of the above

5: Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction ________.

A.   PH 7 and 37 C

B.   Lipase

C.   Coenzyme

D.   Occurs at a faster rate

E.   Oxidoreductase

6: Denaturing gel electrophoresis separates proteins based on differences in _______.

A.   A means of detecting the protein

B.   The amino acid sequences of proteins

C.   Edman degradation

D.   Peptides

7: Enthalpy (h) is the _____.

A.   System's entropy

B.   Cell's energy equilibrium

C.   Condition of a cell that is not able to react

D.   Total energy in biological systems

8: Eukaryotic initiation begins with the assembly of ________________.

A.   Preinitiation complex

B.   Cap-binding complex

C.   Poly-binding complex

D.   48S Initiation complex

9: Fat molecules do not ________.

A.   Mix with H2O

B.   Mix with H

C.   Mix with C

D.   None of these

10: Fats are generally ________ at room temperature and are obtained from ________.

A.   Solids; animals

B.   Solids; plants

C.   Liquids; plants

D.   Liquids; animals

11: In a hydrolysis reaction, __________, and in this process, water is __________.

A.   A polymer is broken up into its constituent monomers...consumed

B.   A nucleotide is to a nucleic acid

C.   Energy storage and release

D.   Dehydration or condensation reactions

12: In living organisms, dna exists as a __________ with the strand(s) __________.

A.   Molecules; chaperonins

B.   Glycosidic; linkages

C.   Disaccharide; double helix

D.   Energy stored; energy released

E.   Double helix; running antiparallel

13: In terms of energy storage, _______ is to animals what _______ is to plants.

A.   Lactose; starch

B.   Sucrose; glucose

C.   Glycogen; starch

D.   Glucose; fructose

E.   Monosaccharides; disaccharides

14: In the peptide glviw, the c-terminal end is ________.

A.   Glycerolphospholipids

B.   Glycine

C.   Arachidonic

D.   Tryptophan

15: In the process of nitrification, nitrate reductase converts _____ into _____.

A.   Nitrate; nitrogen

B.   Nitrate; ammonia

C.   Nitrate; nitrite

D.   Nitrate; nitric oxide

E.   Nitrogen; nitrate

16: Macromolecules, the molecules of life, include all of the following except __________.

A.   Proteins

B.   Carbohydrates

C.   Trace elements

D.   All of the molecules listed are macromolecules.

E.   Nucleic acids

17: Monosaccharide + monosaccharide → ______ + water

A.   Disaccharide

B.   Polypeptide

C.   Polysaccharide

D.   Fat

18: Myoglobin and a single chain of hemoglobin have similar ______ structures.

A.   Primary

B.   Secondary

C.   Tertiary

D.   Quaternary

E.   None of the above

19: Oils are generally ________ at room temperature and are obtained from ________.

A.   Solids; animals

B.   Liquids; plants

C.   Liquids; animals

D.   Solids; plants

E.   None of the above

20: Poisons like cyanide bind to ________ and prevent electron transfer.

A.   Mitochondria

B.   The endoplasmic reticulum

C.   Cytochromes

D.   Enzymes

E.   Acetyl-CoA

21: Side chains of amino acids _____.

A.   A phosphorus atom, P

B.   May be polar or nonpolar

C.   The components of the R-group

D.   It acts as an acid and loses a proton, giving it a negative charge

22: The melting temperature of dna ________ with increasing g plus c content.

A.   Decreases

B.   Increases

C.   Has no relation

D.   Stays the same

23: The skeletal structure below is that of a ________.

A.   Wax

B.   Fat

C.   Stearic

D.   Oleic

24: Which of the following statements is false? saturated fats _____.

A.   Usually solidify at room temperature

B.   Are more common in animals than in plants

C.   Contain more hydrogen than unsaturated fats that consist of the same number of carbon atoms

D.   Have many double bonds in the carbon chains of their fatty acids

25: Transgenic animals are currently used ______.

A.   As vectors for use in cloning human DNA

B.   As food

C.   To produce potentially useful proteins

D.   All of the above

26: To make restriction fragments, a dna sample is treated with ______.

A.   DNA ligase

B.   Restriction enzymes

C.   Gel electrophoresis

D.   PCR

27: As water freezes ______.

A.   It loses its polarity

B.   It cools the surrounding environment

C.   Its molecules move farther apart

D.   Its hydrogen bonds break apart

28: A lineweaver-burk plot is a _____.

A.   Double reciprocal plot

B.   Michaelis-Menten plot

C.   Sigmoidal plot

D.   Hyperbolic plot

29: The stoichiometry of the atp synthase f0 base is ________.

A.   A2b2c(10-14)

B.   A3b3c3

C.   Ab2c(10-14)

D.   Abc(10-14

30: Phosphofructokinase is allosterically _____ by high concentrations of _____.

A.   Activated; ATP

B.   Inhibited; ATP

C.   Inhibited; fructose-2,6-bisphosphate

D.   Activated; fructose -2,6-bisphosphate

31: The nucleotide sequence of a polynucleotide chain is called the ________ structure.

A.   Primary

B.   Secondary

C.   Local

D.   None of these

32: The amphipathic property of phospholipids can be described as ________.

A.   Polar region that dissolves in water and a nonpolar region that repels water

B.   Polar region that repels water and a nonpolar region that dissolves in water

C.   Both regions dissolved in water

D.   Both regions repel water

33: __________ is always involved in hydrolysis reactions.

A.   ATP

B.   H+

C.   OH- Synthesis.

D.   Water

34: Sticky ends are produced as a result of the action of ______.

A.   A clone

B.   DNA ligase

C.   A restriction enzyme

D.   Humulin

35: A higher concentration of molecules causes a faster chemical reaction. this is known as _____.

A.   The law of mass action

B.   Chemical equilibrium phenomenon

C.   Activation energy

D.   Metabolism

36: Biochemistry is the study of _____

A.   Polar molecule regulates temperature universal solvent

B.   Ionic bond

C.   Number of protons

D.   Energy and matter within living organisms

37: Centrifuges used for biohazardous materials must be covered primarily to avoid _____.

A.   Continuously drawing air into the cabinet prevents contaminated air out the open face area.

B.   No more than 1% of the body weight at one time

C.   Contamination via aerosol formation.

D.   BioSafety Level (BSL)2

38: The co2 produced in the pentose phosphate shunt comes from carbon number _____ of glucose.

A.   1 A COOH group at the end of the carbon skeleton evolves into a CO2 group.

B.   2

C.   6

D.   None of these

39: Cellulose is a polysaccharide with ______ linkages?

A.   B-1,6-glycosidic

B.   A-1,6-glycosidic

C.   A-1.4-glycosidic

D.   B-1.4'-glycosidic

40: 3 % nacl is _________________ to the elodea leaf.

A.   Hypertonic

B.   Hypotonic

C.   Isotonic

D.   Thylakoid

41: In eukaryotes, the first step in the control of gene expression is ______.

A.   A.transcription

B.   MRNA stability control

C.   RNA processing

D.   Chromatin remodeling

42: Glycogen is to animal cells as ________ is to plant cells.

A.   Cellulose

B.   Lipid

C.   Sugar

D.   Protein

E.   Starch

43: Fatty acid groups are referred to as ________ groups.

A.   Acetyl

B.   Acyl

C.   Prenyl

D.   Isoprenoid

E.   Isopentenyl

44: This figure is an example of a(n) _____.

A.   Steroid

B.   Protein

C.   Unsaturated fat

D.   Nucleic acid

E.   Saturated fat

45: During the citric acid cycle, both nad and fad ________ a hydrogen atom and become ________.

A.   Gain; reduced

B.   Gain; stable

C.   Reduce; gained

D.   Reduce; stable

46: Each specific amino acid has a unique ______.

A.   R group

B.   Carboxyl group

C.   Phosphate group

D.   Amino group

47: The hormone __________ induces lipolysis, whereas the hormone __________ inhibits the process.

A.   Epinephrine; adrenocorticotropic hormone

B.   Glucagon; insulin

C.   Insulin; norepinephrine

D.   Glucagon; norepinephrine

E.   Epinephrine; glucagon

48: Enzymes that hydrolyze lipids are ________; substances that emulsify lipids are ________.

A.   Considerably more energy than carbohydrates.

B.   β-oxidation process.

C.   Pancreatic lipases; bile salts

D.   Small intestine

49: Anomers of d-glucopyranose differ in their stereochemistry at ________.

A.   C5

B.   C4

C.   C2

D.   C1

50: The membrane's permeability to sodium ions is at its maximum at label _____.

A.   A

B.   B

C.   C

D.   D