biology

3. a compound which is one of the four constituent bases of nucleic acids
6. basic building block of nucleic acids
8. the basic physical unit of inheritance
11. of the structure of a DNA molecule
15. bond-an intermolecular force
16. a substance that is insoluble in water and soluble in alcohol, ether, and chloroform
17. organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes
22. up of chemical 'building blocks' called amino acids
23. compound that occurs in guano and fish scales
24. the interatomic linkage that results from the sharing of an electron pair between two atoms
25. a sequence of three nucleotides which together form a unit of genetic code

1. a single set of unpaired chromosomes
2. A form of phosphoric acid
4. to the body
5. mature haploid male or female germ cell
7. containing two complete sets of chromosomes-a threadlike structure of nucleic acids and protein found in the nucleus
9. acid- molecules that combine to form proteins
10. sugar derived from ribose
12. whose cells have a nucleus enclosed within a nuclear envelope
13. one of four chemical bases in DNA
14. a biological catalyst
18. simple sugar and carbohydrate
19. helix-description of the structure of a DNA molecule
20. is a nucleotide
21. minute particle consisting of RNA and associated proteins