Question

Are these correct?

DNA - MULTIPLE CHOICE (2 pts) How many nurogenous bases are there in DNA? AT B) 2 C)3 ) - Which of the following is not a nitrogenous base found in DNA? A) Adenine B) Cytosine C) Guanine Uracil DNA is made up of Nitrogenous base pairs. The bases bond in which of the following patterns? A) Adenine - Thymine: Cytesine Guanine B) Adenine - Cytosinc; Guanine - Thymine C) Adenine - Guanine; Cytosine - Thymine D) Adenine - Guanine; Cytosine - Taurine d) DNA looks like a "twisted ladder". If the "rungs" of the ladder are made up of nitrogenous bases, what are the hand rails or backbone of the ladder made up of? A) Sugars and Salts B) Phosphates C) Sugars D) Sugars and Phosphates e) Where is DNA located in the cell? A) Mitochondria B) Cell Membrane ) Nucleus D) A & B IN 8 2 2 3 A) purine Ng H Is the above compound a B) pyrimidine? g) __Would the above compound occur in A) DNA B) RNA) C) neither h) During nucleotide polymerization, a pair of phosphates are liberated. This compound is called A) leftover phosphates B) biphosphate (C) pyrophosphate) D) bisphosphate

Answer 1

1. There are 4 nitrogenous bases in DNA. This is correct.

2. Uracil is found in RNA and not DNA. This is correct.

3. Adenine binds with Thymine while Guanine binds with Cytosine. This is correct.

4. Each nucleotide is made up of sugar, phosphate and a nitrogenous base. Two strands are joined by base pairing of the nitrogenous bases whereas sugar and phosphate form the backbone. This is correct.

5. DNA is found in the nucleus. This is correct.

6. The compound is a Purine since there is a pyrimidine ring fused to an imidazole ring. This is correct.

7. This compound is 2'-deoxyribose sugar and is found in DNA. RNA will contain ribose sugar in which case the 2' Carbon will also have an OH group attached. This is incorrect.

8. During nucleotide polymerization, a phosphodiester bond is formed between the 5' end of one nucleotide and the 3' end of another nucleotide. This leads to te release of a pyrophosphate which is then hydrolysed to drive the reaction forward. This is correct.