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Chapter 12 - DNA and RNA
Across
6. copying process by which a cell duplicates its DNA
8. gene mutation involving changes in one or a few nucleotides
11. expressed sequence of DNA; codes for a protein
12. enzyme similar to DNA polymerase that binds to DNA and separates the DNA strands during transcription
14. type of RNA molecule that transfers amino acids to ribosomes during protein synthesis
15. process in which one strain of bacteria is changed by a gene or genes from another strain of bacteria
16. sequence of DNA that is not involved in coding for a protein
18. group of three bases on a tRNA molecule that are complementary to an mRNA codon
19. granular material visible within the nucleus; consists of DNA tightly coiled around proteins
20. enzyme involved in DNA replication that joins individual nucleotides to produce a DNA molecule
Down
1. protein molecule around which DNA is tightly coiled in chromatin
2. region of DNA that indicates to an enzyme where to bind to make RNA
3. decoding of a mRNA message into a polypeptide chain
4. virus that infects bacteria
5. principle that bonds in DNA can form only between adenine and thymine and between guanine and cytosine
7. monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
9. region of chromosome in an operon to which the repressor binds when the operon is “turned off”
10. process in which part of the nucleotide sequence of DNA is copied into a complementary sequence in RNA
13. RNA molecule that carries copies of instructions for the assembly of amino acids into proteins from DNA to the rest of the cell
17. group of genes operating together