I'd like you to check these sentences grammatically. I also would like you to see if the terminology I used is correct. Help me improve my paragraph, please.
1)DNA contains instructions which decide which proteins a cell will make and consequently determines the whole chemistry of the cell.DNA is found in chromosomes. It is one of the most important kinds of molecules found in living things.
2)DNA molecules are made up of two long chains of smaller molecules, called nucleotides. So DNA is a polynucleotide.The two chains of nucleotides wind round one another (?) in a helix. The shape of a 2) DNA molecule is a double helix.
3) There are four different kinds of nucleotides in a DNA molecule.They are known by the letters A, which stands for Adenine, T (Thymine), C (Cytosine) and G (guanine).
4) The nucleotides can be arranged in any order along one of the DNA strands.The order of the nucleotides determines the kinds of proteins which the cell will make. Chemical bonds between opposite nucleotides hold the two strands together.
5)DNA carries the genetic code.
Proteins are chains of amino acids. There are about 20 kinds of amino acids (in a protein chain?). The sequence of these different amino acids in a protein chain determines what kind of protein it is.
6) A part of a DNA molecule which gives instructions for making one kind of protein is called gene.It carries the instructions in the form of a code, called the genetic code. The code is a “three letter” code.
7) The letters are the nucleotides on one of the DNA strands in the double helix. A row of three nucleotides is a “code-word”, which stands for a particular amino acid.
1) You could combine the last two sentences by adding "and" OR by using a semicolon.
2) no comma after molecules. Rather than "rund" use "around"
3) Is there a reason you did not capitalize "guanine?"
6) ...is called a gene.
Sra
1) The sentences are grammatically correct. The terminology used is generally correct as well. However, it would be clearer to say "DNA contains instructions that determine which proteins a cell will produce and subsequently influences the entire chemistry of the cell." Additionally, you could replace "kinds of molecules" with "molecular structures" to be more specific.
2) The sentences are grammatically correct. However, instead of saying "The two chains of nucleotides wind round one another in a helix," it would be more accurate to say "The two chains of nucleotides spiral around each other in the shape of a helix."
3) The sentences are grammatically correct. To make it clearer, you can rephrase the sentence like this: "A DNA molecule consists of four different kinds of nucleotides, each represented by a letter: A for Adenine, T for Thymine, C for Cytosine, and G for Guanine."
4) The sentences are grammatically correct. However, to improve clarity, you can rephrase the sentence like this: "The order in which the nucleotides are arranged along one of the DNA strands determines the types of proteins that the cell will produce. Chemical bonds between complementary nucleotides hold the two strands together."
5) The sentences are grammatically correct. Instead of saying "There are about 20 kinds of amino acids (in a protein chain?)," it would be more accurate to say "Proteins are composed of chains of approximately 20 different types of amino acids."
6) The sentences are grammatically correct. Instead of saying "A part of a DNA molecule which gives instructions for making one kind of protein is called gene," it would be clearer to say "A gene is a segment of DNA that contains instructions for creating a specific protein. These instructions are encoded in a three-letter genetic code."
7) The sentences are grammatically correct. However, to improve clarity, you can rephrase the sentence like this: "The three letters of the genetic code are represented by nucleotides on one of the DNA strands in the double helix. Each set of three nucleotides forms a 'codon' and corresponds to a specific amino acid."