Строение и функции белков

Open Ended

In your opinion, how does the structure of proteins influence their function in living organisms?

Multiple Choice

Why are proteins considered essential for all living organisms?

• Because they provide energy for movement

• Because they are natural organic compounds that ensure all vital processes

• Because they store genetic information

• Because they help in photosynthesis

Multiple Choice

Which elements are commonly found in the composition of proteins?

• Carbon, hydrogen, nitrogen, oxygen, sulfur

• Calcium, potassium, sodium, chlorine

• Magnesium, phosphorus, fluorine, iodine

• Silicon, boron, arsenic, selenium

Open Ended

How do dipeptides and tripeptides form from amino acids?

Multiple Choice

Which type of chemical bond is responsible for linking amino acids together in a protein chain?

• Peptide bond

• Hydrogen bond

• Ionic bond

• Disulfide bond

Fill in the Blanks

Fill in the blank: The primary structure of a protein is a straight chain of

held together by peptide bonds.

Open Ended

Explain how the quaternary structure of proteins differs from the tertiary structure, and describe the types of interactions that stabilize the quaternary structure.

Multiple Select

Which of the following statements about protein structure is/are correct?

• Secondary structure involves the formation of a spiral stabilized by hydrogen bonds.

• Tertiary structure is the folding of polypeptide chains into globules.

• Primary structure is the sequence of amino acids in a chain.

• Quaternary structure involves only one polypeptide chain.

Fill in the Blanks

During denaturation, the protein loses its

structure.

Multiple Choice

What is the main difference between hydrolysis and denaturation of proteins as described in the images?

• Hydrolysis breaks peptide bonds, denaturation disrupts protein structure without breaking peptide bonds.

• Hydrolysis and denaturation both break peptide bonds.

• Denaturation only occurs in the presence of acids, hydrolysis does not.

• Hydrolysis forms new proteins, denaturation does not.

Multiple Choice

What is the term for the process in which the structure of a protein is restored after denaturation, as described in the images?

• Renaturation

• Hydrolysis

• Oxidation

• Polymerization

Multiple Select

Which of the following chemicals can cause denaturation of proteins, as shown in the images?

• Sulfuric acid

• Copper sulfate

• Urea

• All of the above

Open Ended

Explain the process of renaturation and under what conditions it can occur, based on the images provided.

Fill in the Blanks

Proteins are made up of individual

, which can be separated by protease enzymes.

Multiple Choice

What is the main visual change observed when a protein reacts with copper sulfate and sodium hydroxide in the biuret test?

• The solution turns purple

• The solution turns yellow

• The solution turns green

• The solution turns red

Open Ended

Describe the process and result of the xanthoproteic reaction when concentrated nitric acid is added to a protein solution and heated.

Multiple Choice

Which protein is responsible for muscle contraction in multicellular animals?

• Actin and myosin

• Hemoglobin

• Insulin

• Keratin

Multiple Select

Which of the following are functions of proteins in the human body?

• Enzyme catalysis

• Hormone regulation

• Structural support

• Energy storage

Open Ended

Explain how hemoglobin functions as a transport protein in the human body.

Multiple Select

Select all the functions of proteins that involve enzymes or catalysis.

• Catalytic

• Regulatory

• Energetic

• Protective

Open Ended

Explain how proteins contribute to both the regulation and protection of the organism, using examples from the slides.

Multiple Choice

Which of the following is NOT a function of proteins described in the slides?

• Regulatory

• Energetic

• Protective

• Transport

Fill in the Blanks

In 1838,

discovered proteins.

Multiple Choice

Proteins are natural organic compounds that ensure all vital processes of any organism. What is the Greek origin of the word 'protein'?

• Protos, meaning 'first'

• Proteus, meaning 'change'

• Proton, meaning 'positive'

• Protozoa, meaning 'animal'

Open Ended

Reflecting on today's lesson about proteins, what is one new thing you learned about the structure or function of proteins?