The diagram shows a stage in the The diagram represents part of a molecule of DNA on synthesis of part of a polypeptide. which a molecule of RNA is being synthesised. Amino acid What does component X represent? tRNA A Ribose sugar mRNA B Deoxyribose sugar T A T DNA C Phosphate D Ribose phosphate Identify the triplet codes for the amino acid DNA controls the activities of a cell by coding for the tyrosine. production of A proteins carbohydrates B C amino acids D bases A DNA nucleotide could be formed from a molecule of phosphate together with The base sequence of a short piece of DNA is shown below Ribose sugar and guanine A G C T T A C G Ribose sugar and uracil Deoxyribose sugar and uracil During replication, an inversion mutation Deoxyribose sugar and uracil occurred on the complementary strand synthesised on this piece of DNA. If a DNA molecule contains 8000 nucleotides of which 20% are adenine, then the number of guanine nucleotides present is: A. A 1600 B 2000 C 2400 B. 3200 D C. D. 16. The table below refers to the mass of DNA During the polymerase chain reaction (PCR) samples in certain human body cells. of DNA are repeatedly heated and cooled.
The diagram represents part of a molecule of DNA on which a molecule of RNA is being synthesised. What does component X represent? A Ribose sugar B Deoxyribose sugar C Phosphate D Ribose phosphate DNA controls the activities of a cell by coding for the production of A proteins B carbohydrates C amino acids D bases A DNA nucleotide could be formed from a molecule of phosphate together with Ribose sugar and guanine Ribose sugar and uracil Deoxyribose sugar and uracil Deoxyribose sugar and uracil If a DNA molecule contains 8000 nucleotides of which 20% are adenine, then the number of guanine nucleotides present is: A 1600 B 2000 C 2400 D 3200 The diagram shows a stage in the synthesis of part of a polypeptide. Amino acid tRNA mRNA T A T DNA Identify the triplet codes for the amino acid tyrosine. The base sequence of a short piece of DNA is shown below A G C T T A C G During replication, an inversion mutation occurred on the complementary strand synthesised on this piece of DNA. A. B. C. D. During the polymerase chain reaction (PCR) samples of DNA are repeatedly heated and cooled. 16. The table below refers to the mass of DNA in certain human body cells.