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Proteins

Proteins are the macromolecules coded in our DNA that function as a biocatalyst and build our body. Apart from Biological knowledge, there are spectacular concepts in the field of proteins. How does a protein produce a function, how do they interact, how did they evolve and how do protein mutations cause disease.

460 Questions

What are amino acids and how many are there?

An amino acid is the basic unit of proteins (including peptides and enzymes). The amino acid molecule is formed by an amino group and a carboxylic group linked to a carbon atom (the alpha carbon), and a side chain group that gives their identity. There are 20 natural or "standard" amino acid molecules. Generally, are grouped according to the polarity of their side chains or "R" groups. According to this classification scheme, there are three major types of amino acids:

  1. those with nonpolar groups. Glycine, alanine, valine, leucine, isoleucine, methionine, proline, phenylalanine and tryptophan, form this type of amino acids.
  2. those with uncharged polar side chains or R groups. This type is formed by the amino acids serine, threonine, asparagine, glutamine, tyrosine, and cysteine.
  3. those with polar side chains. This type is formed by amino acids lysine, arginine, histidine, aspartic acid and glutamic acid.

Which major minerals occur in proteins?

Major minerals or macronutrients are present in the body at amounts (0.1%-2% by mass).

minerals that occur in proteins is among the (0.1%-2% by mass) macronutrients that are in the human body

Magnesium and Sulfur are the major minerals that occur in proteins within the human body

source from: General, Organic, and Biological Chemistry Vol. 1 by Janice Gorzynski Smith Chapter 2, Page 36.

What organelle combines proteins?

the ribosomes produce protein...these small structures function as factories to produce proteins. Ribosomes may be attached to the endoplasmic reticulum, or they may float in the cytoplasm. I'm not so sure if they COMBINE the proteins.

What 2 transport processes use carrier proteins?

Two transport processes that use carrier proteins are facilitated diffusion and active transport. In facilitated diffusion, carrier proteins help move molecules across the cell membrane down their concentration gradient, while in active transport, carrier proteins help move molecules against their concentration gradient by using energy.

What don't proteins do?

Proteins do not replicate on their own, unlike DNA or RNA. They also do not store genetic information like nucleic acids do. Additionally, proteins do not have a role in directly passing on hereditary traits to offspring.

Which enzyme joins the okazagi fragments together on the lagging stand during DNA replication?

DNA ligase joins the Okazaki fragments together on the lagging strand during DNA replication. It catalyzes the formation of phosphodiester bonds between the fragments to create a continuous strand.

What membrane proteins are integral proteins?

Integral membrane proteins include transmembrane proteins, which span the entire lipid bilayer, and lipid-anchored proteins, which are attached to the membrane through lipid molecules. These proteins are essential for various cellular functions such as cell signaling, transport, and structural support. Examples include ion channels, transporter proteins, and receptors.

Are transmembrane proteins amphipathic?

yes, transmembrane proteins have both polar and non-polar regions. This is because these proteins are dispersed through the membrane almost like pieces of stones. So, to be inside the hydrophobic region of the phospholipid bi-layer AND also outside of it in the water or aqueous solution they transmembrane protein needs to be amphipathic.

Which organelle tags proteins?

The Golgi apparatus is responsible for tagging proteins with molecular markers that determine their final destination within the cell or outside of it.

How proteins interact with other proteins?

Protein-protein interaction is a delicate and crucial for the normal cell function such as signalling, replication, cell cycle and so on. It happens with non covalent interactions such as ioni, hydrogen, wanderwall's bonding. protein protein interaction are species specific in terms of host-pathogen proteins.

How is proteins used by an organism?

Proteins are used by organisms for a variety of functions, including serving as enzymes to catalyze chemical reactions, providing structural support for cells and tissues, and acting as signaling molecules to regulate processes within the body. They are also essential for the growth, repair, and maintenance of tissues in the body.

What are two proteins found in meat?

Two proteins found in meat are myosin and actin. Myosin is a motor protein that is critical for muscle contraction, while actin is a structural protein that helps provide shape and support to muscle fibers.

Why are some proteins important biological buffers?

Some proteins can act as biological buffers because they contain ionizable functional groups that can accept or donate protons to help maintain a stable pH in a cell or organism. These proteins can help regulate and minimize changes in pH by absorbing or releasing hydrogen ions as needed. This buffering capacity is crucial for maintaining proper enzyme activity and other biological processes that are pH-sensitive.

What level of protein structure is stablized by covalent bonds?

Primary level.

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Primary level - covalent bonds (peptide)

Secondary level - hydrogen bonds

Tertiary level - hydrogen bonds, ionic bridges, hydrophobic linkages

Quaternary level - H-bonds b/w certain polar side chains, ionic bonds b/w oppositely charged side chains, and van der waals forces b/w non-polar R (rest) groups.

Are proteins a solid?

Proteins are solute molecules found in a dissolved form in buffer. Proteins can be crystallized to form a crystal (solid) by evaporation. This method is used in protein X-ray crystallography to solve its 3D structure.

Does proteins have cells?

Proteins are biomolecules made up of amino acids and are synthesized by cells. Proteins play many vital roles in cells, such as structural support, catalyzing biochemical reactions, and cell signaling. While proteins themselves do not have cells, they are essential components of all living cells.

Do proteins contain sulphur?

Yes they do. proteins are macromolecules that are made up of amino acids connected with peptide linkage. Sulfur containing amino acids such as cysteine, methionine are also can be present in proteins. they are involved in the formation of disulfide linkage in the protein molecule.

What are poly-trophic proteins?

Polytrophic proteins are proteins that can interact with multiple ligands or substrates, each leading to different downstream effects. This versatility allows these proteins to regulate multiple cellular processes and pathways simultaneously. Examples include transcription factors that can influence the expression of multiple genes in response to different signaling molecules.

Do proteins form enzymes?

We have to clearly understand the concept that enzymes are actually, chemically proteins. There are enzymes that are involved in proteins production (peptidyl synthetase), lipid or nucleic acid formation. So a protein can help in forming other protein or enzymes. Most important thing is, all proteins are coded in DNA.

Are sperms proteins?

Sperm or spermatozoa are male germ cells that has one set of chromosomes, known as "n" (unlike somatic cells that has "2n"). Semen (the liquid in which sperms are dispersed) do contains protein albumin and free amino acids. They also do have potent antimicrobial proteins.

Which best describes how proteins from?

Proteins are synthesized by ribosomes in a process called translation, where messenger RNA (mRNA) provides the template for assembling amino acids into a polypeptide chain. Transfer RNA (tRNA) molecules bring specific amino acids to the ribosome based on the mRNA codons, and the ribosome catalyzes the formation of peptide bonds between the amino acids, ultimately leading to the formation of a functional protein.

What is kmef proteins?

abbr. for keratin-myosin-epidermin-fibrinogen group; a group of proteins that have in common an α-type X-ray diffraction pattern. Some of these may show a β-type pattern in some conditions. Silk fibroin, which normally occurs with a β structure, is often included in the KMEF group.

Are bio-catalysts always proteins?

There are a few RNA catalysts are known, but the majority is only proteins. Biochemical reactions are speed by enzymes by lowering the activation energy. Enzymes like other proteins are coded in DNA.

Why enzymes are proteins?

Enzymes are proteins because they are made up of amino acids linked together in a specific sequence, forming a complex three-dimensional structure that allows them to catalyze chemical reactions. This structure is crucial for the enzyme's function and specificity in recognizing and binding to their substrate molecules. Enzymes can be denatured by changes in pH or temperature, highlighting their protein nature.

How proteins differ?

Proteins differ each other in their amino acid composition and the number of amino acids that form it. Not all the proteins are the same, although they are all made up of amino acids. the sequence of amino acids is determined by the mRNA which is transcribed by DNA in the nucleus.