Trivia Quiz About Biochemistry

29 Questions

Settings
Please wait...
Biochemistry Quizzes & Trivia

.


Questions and Answers
  • 1. 
    Which of the following is not true regarding urea cycle
    • A. 

      Main way of excretion of ammonia

    • B. 

      Plasma urea is 15-45 mg/l

    • C. 

      As a result of transamination glutamate combines with acetyl CoA forming N-acetyl glutamate which inhibits CPS I

    • D. 

      2 of the above

    • E. 

      None of the above

  • 2. 
    What happens in the synthesis of non-essential glycine
    • A. 

      Serine changes to glycine by serinehydroxymethyltransferase

    • B. 

      H2O is released in the reactionn above

    • C. 

      Can be formed also from glyoxalate by transamination

    • D. 

      In glycine synthase coenzyme NAD+ is reduced to NADH

    • E. 

      All of the above

  • 3. 
    Regarding Cysteine which of the following is true
    • A. 

      Formed from serine and homocysteine

    • B. 

      PLP Is needed in the reaction of serine & homocysteine

    • C. 

      Cysteine becomes essential if methionine is adequate

    • D. 

      A+B

    • E. 

      C+A

  • 4. 
    What is needed/ happens in the reaction of aspartic acid with asparagine (either way)
    • A. 

      Asparagine synthetase, Gln, Glu, ATP----> AMP + PPi

    • B. 

      Asparagine synthetase, ATP ---> ADP + Pi

    • C. 

      Asparaginase, NH4+, H2O

    • D. 

      Asparaginase lyase, NAD+, ATP ---> AMP + PPi

    • E. 

      asparaginase, NH3, H2O, Gln, Glu

  • 5. 
    Which of the following is/are ketogenic and glucogenic amino acid(s)?
    • A. 

      Alanine

    • B. 

      Tryptophan

    • C. 

      Leucine

    • D. 

      Valine

    • E. 

      A+C

  • 6. 
    Brain damage from high ammonia concentrations is shown through
    • A. 

      Irritability and tremors

    • B. 

      Blurred vision

    • C. 

      Coma

    • D. 

      Inverted sleep rhythm

    • E. 

      All of the above

  • 7. 
    A fatty acid chain with 18 c atoms , the number of ATP that will be produced by complete oxidation on this chain is
    • A. 

      148

    • B. 

      108

    • C. 

      146

    • D. 

      38

    • E. 

      40

  • 8. 
    When there is deficiency in hydroxyacyl coa dehydrogenase E the B oxidation will end in which of the following
    • A. 

      2-hydroxy acyl coa

    • B. 

      B-hydroxyacyl coa

    • C. 

      Alpha-hydroxyacyl coa

    • D. 

      1-hydroxyacyl coa

    • E. 

      None of the above

  • 9. 
    15c atom fatty acid chain one of these at carbon number 3 of the chain ,the number of ATP that will be produced by complete oxidation of this chain is
    • A. 

      114

    • B. 

      28

    • C. 

      30

    • D. 

      84

    • E. 

      112

  • 10. 
    Increase which of the following decreases B oxidation
    • A. 

      AMP

    • B. 

      FAD

    • C. 

      FMN

    • D. 

      Prostaglandins

    • E. 

      None of the above

  • 11. 
    50years old male with carnitine deficiency ,which of the following is true regarding his case
    • A. 

      he complains from cerebellar ataxia

    • B. 

      His liver is highly fatty

    • C. 

      Has decreased uptake of glucose by cardiac muscle

    • D. 

      8c atoms fatty acid chain can be oxidized in his liver cells

    • E. 

      More than one of the above

  • 12. 
    Alpha carbon in Fatty acid is the
    • A. 

      Carbon of the carboxylic group

    • B. 

      Carbon where phytanic Acid oxidation begins

    • C. 

      Last carbon

    • D. 

      Carbon where CoASH binds

    • E. 

      More than one of the above

  • 13. 
    The most important eicosanoids are formed of
    • A. 

      dihomo-γ-linolenic acid

    • B. 

      Arachidonic acid

    • C. 

      Timnodonic acid

    • D. 

      All of the above

  • 14. 
    Cyclooxygenase (COX)is responsible for all the following, Except
    • A. 

      the cyclization of C8-C12 of arachidonic acid to form cyclopentane ring

    • B. 

      The presence of endoperoxide between C9 and C11

    • C. 

      Reduction of the hydroperoxyl group at C15 into hydroxyl group

    • D. 

      Introduces a hydroperoxyl group at C15

  • 15. 
    All the followings enzymes act on the PGH2, which of them will convert it to PGI2:
    • A. 

      Isomerase

    • B. 

      .Prostacyclin synthase

    • C. 

      Reductase

    • D. 

      Thromboxane reductase

  • 16. 
    Inhibits the cyclooxygenase by acetylation
    • A. 

      .hydrocortisone

    • B. 

      Indomethacin

    • C. 

      Aspirin

    • D. 

      Two of the above

  • 17. 
    All the followings are the effects of prostaglangins on different tissues,Except
    • A. 

      Increase cAMP in many endocrine glands leading to increased secretion of their hormones

    • B. 

      Decrease cAMP in other tissues leading to decreased gastric HCL

    • C. 

      PGE produces hypertension

    • D. 

      PGF produces (bronchoconstriction)

  • 18. 
    All the followings are correct about the Lipoxygenase pathway, Except
    • A. 

      Leukotrienes are early discovered in leukocytes

    • B. 

      Leukotrienes are released during anaphylaxis

    • C. 

      LTE4 comprise the slow-reacting substances of anaphylaxis (SRS-A

    • D. 

      Lipoxins may have a role in regulating the immune response

    • E. 

      None of the above

  • 19. 
    L-amino acid oxidase coenzyme is
    • A. 

      FAD

    • B. 

      NAD+

    • C. 

      FMD

    • D. 

      FMN

  • 20. 
    Transamination can occur in
    • A. 

      Liver

    • B. 

      Kidney

    • C. 

      Muscles

    • D. 

      All tissues

  • 21. 
    The main mechanism for deamination of amino acids is
    • A. 

      Transdeamination

    • B. 

      Transmination

    • C. 

      Oxidative deamination

    • D. 

      Reductive deamination

  • 22. 
    H2O2 is produced as a side product in
    • A. 

      Transdeamination

    • B. 

      Transamination

    • C. 

      Oxidative deamination

    • D. 

      Reductive deamination

  • 23. 
    Alanine transaminase(ALT) doesn't include
    • A. 

      PLP

    • B. 

      Oxaloacetic acid

    • C. 

      Pyruvic acid

    • D. 

      None of the above

  • 24. 
    One of these is not needed to form Glutamine
    • A. 

      ATP

    • B. 

      NH3

    • C. 

      Glutamic acid

    • D. 

      α-ketoglutaric acid

  • 25. 
    One of the following is not included in the process of synthesis of FA
    • A. 

      Extramitochondrial system

    • B. 

      Microsomal system

    • C. 

      Peroxisomal system

    • D. 

      Mitochondrial system

  • 26. 
    One of the following is considered as a stem fatty acid
    • A. 

      Arachidonic acid

    • B. 

      Phtanic acid

    • C. 

      Adipic acid

    • D. 

      Palmitic acid

  • 27. 
    One of the following statements is false
    • A. 

      Fatty acid synthase multi-enzyme complex is in its active form when it is a dimer

    • B. 

      Each monomer contains 2 SH groups the first one is carried by phosphopantetheine and the other one is carried by ketoacyl reductase enzyme.

    • C. 

      Acetyl coA carboxylase requires Mn+2 and biotin

    • D. 

      Thioesterase enzyme is also called deacylase.

  • 28. 
     the reaction of transformation of beta ketoacyl enzyme to beta hydroxyacyl enzyme is catalyzed by
    • A. 

      Ketoacetyl reductase

    • B. 

      Enoyl reductase

    • C. 

      Dehydratase

    • D. 

      Ketoacyl reductase

  • 29. 
    The enzyme that catalyze the decomposition of citrate in the cytosol to OAA and acetyl-coA is
    • A. 

      ADP citrate synthase

    • B. 

      ADP OAA lyase

    • C. 

      ATP- coA lyase

    • D. 

      ATP - citrate lyase