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CLEP Natural Science

Subjects : clep, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Modification of a cell by the incorporation of exogenous DNA






2. Part of stem where growth occurs - contains meristem tissue that is capable of quick growth






3. Double-stranded chains of proteins which give structure to the cell






4. Classification of plant which forms seeds inside a protective chamber called an ovary - inside a flower






5. A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix






6. Powerhouse of the cell - organelle that is the site of ATP (energy) production






7. Tubes - One of two tiny structures located in the cytoplasm of animal cells near the nuclear envelope; play a role in cell division.






8. The second phase of mitosis - during which the chromosomes line up across the center of the cell






9. Projections on cell membrane increase surface area






10. The substance acted upon by an enzyme






11. The female part of a flower composed of ovary and style and stigma and ovules






12. Process by which a cell releases large amounts of material






13. Three-nucleotide sequence on messenger RNA that codes for a single amino acid






14. Area where the chromatids of a chromosome are attached






15. Classification of plant whose life cycle survives two seasons






16. Reproductive cells - have only half the number of chromosomes






17. Production of a chemical compound by a living organism






18. Breakdown of more complex substances into simpler ones with release of energy






19. The stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle






20. Have tissues made of cells that transport water and nutrients throughout the plant






21. Consists of DNA tightly coiled around proteins






22. The interchange of sections between pairing homologous chromosomes during the prophase of meiosis






23. An internal membrane system in which components of cell membrane and some proteins are constructed. rough - instrumental in protein synthesis; smooth - processes lipids fats and steroids






24. Cell division which produces two identical cells






25. (adenosine triphosphate) main energy source that cells use for most of their work






26. Site of protein synthesis. Free ribosomes - float unattached; attached ribosomes - attached to the ER






27. Strong layer around the cell membrane in plants - algae - and some bacteria made of cellulose and lignin






28. Body of a chloroplast containing grana






29. The process of transfering genetic material from one cell to another






30. Proteins that act as biological catalysts






31. Change in a DNA sequence that affects genetic information






32. Reducing the ploidy level of nucleus from diploid to haploid in meiotic cell division






33. Structure within ovary of plant that contains egg cells






34. The organ that bears the ovules of a flower - base of the pistil






35. Sequence of DNA that codes for a protein and thus determines a trait






36. Cells that lack a membrane-bound nucleus and membrane-bound organelles






37. Different forms of a gene






38. A cell having only one complete set of chromosomes






39. Smallest unit of most living things






40. Cell division that produces reproductive cells in sexually reproducing organisms






41. The regular sequence of growth and division that cells undergo






42. Vacuole membrane






43. A non-protein - but organic - molecule (such as vitamin) that is covalently bound to an enzyme as part of the active site






44. Hollow tubes of protein about 25 nanometers in diameter - support the cell and moves organelles within the cell






45. Has a nucleus - has organelles or other cell parts






46. Membrane-bound organelle that stores water and soluble substances






47. Photosynthetic reaction in which carbon dioxide is attached to an organic compound (glucose - polysaccharides)






48. Bead-like structure in chromatin - composed of a short length of DNA wrapped around a core of histone proteins






49. Set of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes






50. The stalk of a stamen that supports the anther