Class Date Name phesphate Cytosine The chemical group in box 5 of the accompanyi

Question

Class Date Name phesphate Cytosine The chemical group in box 5 of the accompanying figure is a: a. hydrogen bond b. phosphate. c. nucleotide. d. pyrimidine e. protein 8 X-ray diffraction studies are used to determine the: a. sequence of amino acids in protein molecules b. sequence of nucleotides in nucleic acid molecules c. distances between atoms of molecules d. identity of an unknown chemical. Okazaki fragments are joined together by: a. RNA polymerase. b. DNA ligase c. DNA polymerase d. RNA ligase. e. primase Unlike normal cells, cancerous cells: a have reduced levels of telomerase. b. divide only a few times before undergoing cell death. 70 Cengage Leaming Testing, Powered by Cogner

Explanation / Answer

7. The chemical group in box 5 is a phosphate group. Phosphate has a chemical formula PO43- ,it is made up of one phosphorous attached to four oxygen atoms. It forms part of genetic materials DNA and RNA. It is also found in ATP molecules.

8. X-ray diffraction studies are used to identify unknown chemical. The most wide application is for identification of unknown crystalline materials like minerals, inorganic compounds etc. It also measures purity of a given substance.

9. Okazaki fragments are joined together by DNA ligase enzyme. Okazaki fragments are new DNA fragments which are synthesized during DNA replication.

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