Biology Crossword Puzzle

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Across
  1. 3. Occur freely in the cytosol whereas others are attached to the nuclear membrane or to the endoplasmic reticulum (ER) giving the latter a rough appearance, hence, the name rough ER or rough ER.
  2. 4. The material of which the chromosomes of organisms other than bacteria are composed. It consists of protein, RNA, and DNA.
  3. 7. A compound that is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with thymine in double-stranded DNA.
  4. 8. The two twentieth-century biologists who discovered the double helix of DNA.
  5. 11. A set of three adjacent nucleotides, also called triplet, in mRNA that base-pair with the corresponding Aniticodon of RNA molecule that carries a particular amino acid, hence, specifying the type and sequence of amino acids for protein synthesis.
  6. 12. An enzyme that bonds compounds (Ex: A is paired with T)
  7. 13. An enzyme that breaks the bonds of DNA during replication.
  8. 14. One of the pairs of chemical bases joined by hydrogen bonds that connect the complementary strands of a DNA molecule or of an RNA molecule that has two strands; the base pairs are adenine with thymine and guanine with cytosine in DNA.
  9. 15. A compound consisting of a nucleoside linked to a phosphate group
  10. 19. A sugar derived from ribose by replacing a hydroxyl group with hydrogen
  11. 20. A compound found in living tissue as a constituent base of nucleic acids. It is paired with guanine in double-stranded DNA.
  12. 21. Non-coding, intervening sequences of DNA that are transcribed, but are removed from within the primary gene transcript and rapidly degraded during maturation of messenger RNA. most genes in the nuclei of eukaryotes contain introns, as do mitochondrial and chloroplast genes.
  13. 23. A sequence of three adjacent nucleotides located on one end of transfer RNA. It bounds to the complementary coding triplet of nucleotides in messenger RNA during translation phase of protein synthesis.
  14. 24. A compound that is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with cytosine in double-stranded DNA.
Down
  1. 1. A permanent, heritable change in the nucleotide sequence in a gene or a chromosome; the process in which such a change occurs in a gene or in a chromosome.
  2. 2. A step in protein biosynthesis wherein the genetic code carried by mRNA is decoded to produce the specific sequence of amino acids in a polypeptide chain. The process follows transcription in which the DNA sequence is copied (or transcribed) into an mRNA.
  3. 5. A nucleic acid present in all living cells. Its principal role is to act as a messenger carrying Instructions from DNA for controlling the synthesis of proteins
  4. 6. A weak type of chemical bond formed when the slightly positive hydrogen atom of a polar covalent bond is attracted to the slightly negative atom of a polar covalent bond in another molecule; a common bond in organisms that has an attractive force between a hydrogen atom and another molecule.
  5. 9. Is the process of transcribing or making a copy of genetic information stored in a DNA strand into a complementary strand of RNA.
  6. 10. A nitrogenous base is a nitrogen-containing organic molecule having the chemical properties of a base.
  7. 12. A salt or ester of phosphoric acid, containing PO4
  8. 16. The protein-coding region in the DNA; The nucleic acid sequence in the DNA, or RNA transcript following genetic splicing.
  9. 17. A compound that is one of the four constituent bases of nucleic acids. A pyrimidine derivative, it is paired with adenine in double-stranded DNA.
  10. 18. The action of reproducing new DNA.
  11. 22. Self-replicating material present in nearly all living organisms;It is the carrier of genetic information.
  12. 24. The fundamental, physical, and functional unit of heredity.