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  • Question
  • Amino acids can be distinguished from one another by


  • Options
  • A. type of bond between the R group and the rest of the molecule
  • B. the number of R groups found on the amino acid molecules
  • C. the chemical properties of their R groups
  • D. the chemical properties of the amino and carboxyl groups

  • Correct Answer
  • the chemical properties of their R groups 

    Explanation

    Amino acids are organic compounds containing amine (-NH2) and carboxyl (-COOH) functional groups, along with a side chain (R group) specific to each amino acid.

     

    Depending on the nature of the side chain groups, three classes of aminoacids can e distinguished:

    1. Amino acids with H ond donor and acceptor groups.

    Histidine, lysine, aspartic acid, threonine,...

    2. Amino acids with donor grups only.

    Arginine, tryptophan and cysteine.

    3. Amino acids with acceptor groups only.

    Asparagine and glutamine.

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    Biology problems


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    • 1. Which stage of cellular respiration produces the most ATP?

    • Options
    • A. Glycolysis
    • B. Kreb's cycle
    • C. Electron transport chain
    • D. All the above
    • Discuss
    • 2. Tissue that connects muscle to bone

    • Options
    • A. Tendons
    • B. Joint capsule
    • C. Body fiber
    • D. Ligament
    • Discuss
    • 3. A gland below the bladder and surrounding the urethra?

    • Options
    • A. Prostate
    • B. Vas deferens
    • C. Seminal vesicle
    • D. Bulbourethral
    • Discuss
    • 4. Which of these is NOT a lipid?

    • Options
    • A. Wax
    • B. Cholesterol
    • C. RNA
    • D. Phospholipid
    • Discuss
    • 5. In plants, chloroplasts are necessary for

    • Options
    • A. photosynthesis
    • B. storage
    • C. cell movement
    • D. respiration
    • Discuss
    • 6. What part of the body controls balance?

    • Options
    • A. Cerebrum
    • B. Cerebellum
    • C. Medulla oblangata
    • D. Amygdala
    • Discuss
    • 7. Movement of cell against concentration gradient is called

    • Options
    • A. active transport
    • B. diffusion
    • C. osmosis
    • D. passive transport
    • Discuss
    • 8. Bacteria divide by

    • Options
    • A. Binary Fusion
    • B. Cytokinesis
    • C. Binary Fission
    • D. Both B & C
    • Discuss
    • 9. Basophils increase in number when parasitic invasion occurs.

    • Options
    • A. TRUE
    • B. FALSE
    • Discuss
    • 10. What is the functional unit of a skeletal muscle called?

    • Options
    • A. Myofibril
    • B. Sarcomere
    • C. Fiber
    • D. Fasciculus
    • Discuss


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