1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lara [203]
2 years ago
11

Proteins, large complex molecules, are major building blocks of all living organisms. Discuss the following in relation to prote

ins.
(a) The chemical composition and levels of structure of proteins.
(b) The roles of DNA and RNA in protein synthesis
(c) The roles of proteins in membrane structure and transport of molecules across the membrane
Biology
1 answer:
Anastasy [175]2 years ago
7 0

Answer:

Proteins, large complex molecules, are major building blocks of all living organisms. Discuss the following in relation to proteins.

(a) The chemical composition and levels of structure of proteins.

Proteins are chemically macromolecules formed by manomeric units called amino acids. The structural organization of proteins is as follows:  Primary, Secondary, Tertiary and Quaternary.

(b) The roles of DNA and RNA in protein synthesis

From DNA, ribosomal RNA is formed, a type of RNA present in ribosomes that is responsible for protein synthesis. Therefore, the role of DNA in protein synthesis is essential: without DNA, there are no proteins.

(c) The roles of proteins in membrane structure and transport of molecules across the membrane

Proteins can work by transporting ions in different ways.

Explanation:

(a) The chemical composition and levels of structure of proteins.

Proteins are chemically macromolecules formed by manomeric units called amino acids, these have in their structure a carboxyl group and amino group, attached to the same carbon. To be assimilated by the body, proteins must be degraded in the amino acids that make them up.

The amino acids are linked together by peptide bonds. In those bonds, the amino group of one amino acid reacts with the carboxyl group of the other.

The structural organization of proteins is as follows:

Primary: Sequence of the amino acids in the chain with peptide bonds.

Secondary: Spatial arrangement of the amino acids of a protein. They stabilize by means of hydrogen bonds. There are two types: the propeller a and the folded blade b.

Tertiary: Three-dimensional arrangement of the polypeptide chain, stabilized by forces of Waals.

Quaternary: Union of weak bonds of arias polypeptic chains that originate a protein complex.

(b) The roles of DNA and RNA in protein synthesis

RNA fulfills numerous functions, the most important being protein synthesis, in which it copies the genetic order contained in the DNA to use it as a standard in the manufacture of proteins and enzymes and various substances necessary for the cell and the organism. For this, it goes to the ribosomes, which operate as a kind of molecular protein factory, and it does so following the pattern that the DNA prints on it.

(c) The roles of proteins in membrane structure and transport of molecules across the membrane

The cells contain proteins that are embedded in the lipid bilayer of their plasma membranes. These proteins can work by transporting ions in different ways. Then, most of the water-soluble ions and molecules are unable to spontaneously cross the lipid bilayer of the membrane (which act as a barrier) and require the concurrence of special carrier proteins or protein channels. In this way the cell maintains concentrations of ions and small molecules different from those prevailing in the external environment.

You might be interested in
Vancouver, British Columbia, enjoys a moderate year-round climate due to _____.
arsen [322]
It’s proximity to the Pacific Ocean.

Explanation: Vancouver has an oceanic climate and has, in winter, the second highest average temperature in the country, just behind Victoria. Its summer, however, is one of the mildest in the country.
5 0
3 years ago
External vs Internal environment
inna [77]

Answer:

Internal environmental factors are events that occur within an organization. External environmental factors are events that take place outside of the organization and are harder to predict and control.

3 0
3 years ago
Based on the data that you collected from the virtual lab, which primate had the largest skull or supraorbital height (SHI)?
goldenfox [79]

Answer:

The Answer is Australopithecus afarensis

Explanation:

7 0
2 years ago
HELP
Phoenix [80]

Answer:

c

Explanation:

c

6 0
3 years ago
Why do you get hungry?
suter [353]

Answer:You may feel hungry frequently if your diet lacks protein, fiber, or fat, all of which promote fullness and reduce appetite. Extreme hunger is also a sign of inadequate sleep and chronic stress. Additionally, certain medications and illnesses are known to cause frequent hunger.

Explanation:

"Hunger hormones" (ghrelin) in your blood and an empty stomach signal the brain when you're hungry. Nerves in the stomach send signals to the brain that you're full, but these signals can take up to 20 minutes to communicate -- and by that time, you may have already eaten too much.

8 0
2 years ago
Other questions:
  • Do plants grow better with classical music?
    15·2 answers
  • Match each step of the scientific method with its description
    5·1 answer
  • Assume there is a certain population of fish in a pond whose growth is described by the logistic equation. It is estimated that
    11·1 answer
  • Plz help me outttttt
    13·2 answers
  • 3.
    12·1 answer
  • Chemotherapy and Radiation therapy target which cells?
    8·1 answer
  • Which example describes an adaptation of a blueberry plant in the summer? Buds begin to form. The leaves turn red. The plant is
    14·1 answer
  • Label the following terms in the following picture
    13·1 answer
  • Please help with questions 2-5. Will mark branliest!!
    7·1 answer
  • Which process is a form of autotrophic nutrition?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!