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ikramhamideh
03.07.2019 •
Biology
Explain the importance of enzymes to living organisms?
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Ответ:
Enzymes are organic catalysts which aid in facilitating chemical reactions in the body. Enzymes are needed for metabolic pathways in the body, respiration, digestion and other important life processes. When enzymes function properly, homeostasis is maintained.
Ответ:
1. DNA molecule is a double helix of 2 complementary polynucleotide strands;;
2. The two strands coil around each other to form a right-handed double helix;;
3. The strands are antiparallel, i.e. run in opposite directions (one strand runs in
the 5’ to 3’ direction while the complementary strand runs in the 3’ to 5’
direction);;
4. Each (polynucleotide) strand consists of very long chain of nucleotides, with
each nucleotide comprising of a deoxyribose sugar, a phosphate group and one
of the four nitrogenous bases - Adenine, Thymine, Cytosine or Guanine;;
5. Each strand contains a sugar-phosphate backbone – comprising of nucleotides
arranged in sequence, held together by phosphodiester bonds between C3 of
the (deoxyribose) sugar of one nucleotide and C5 of the (deoxyribose) sugar of
the adjacent nucleotide;;
6. The nitrogenous bases are arranged as side groups of the polynucleotide
strands (oriented toward the central axis);;
7. The width between the 2 sugar-phosphate backbones is constant at 2nm, this is
equal to the width of 1 base pair, i.e. 1 purine + 1 pyrimidine;;
8. One complete turn of the double helix measures 3.4nm in length and comprises
10 base pairs;;
9. The double helical nature of DNA results in the surface of the DNA molecule to
have major grooves and minor grooves;;
10. The nitrogenous bases of 1 strand pair with nitrogenous bases of the opposite
strand via hydrogen bonds. There are 2 hydrogen bonds between adenine and
thymine, and 3 hydrogen bonds between cytosine and guanine;;
11. Base pairing is complementary, i.e. adenine pairs with thymine, guanine pairs with cytosine. The base-pairing is specific and the 2 strands are said to be
complementary (i.e. no. of A = no. of T, no. of G = no. of C,);;
12. (extra pt) The DNA molecule is further stabilised by hydrophobic interactions between the stacked nitrogenous bases;;
13. The nucleosomes are connected by linker DNA and associates with H1 forming the nucleohistone complex;
14. Interactions between the H1 histones (histone tails of octamers and linker DNA) results in further coiling into a 30nm chromatin fibre;
15. The 30nm chromatin fibre form looped domains that are attached to a scaffold of non-histone proteins, giving rise to a 300nm fibre;