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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. Pores which allows materials to move in and out of the cell nucleus






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






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






4. Stalk that supports the flower






5. Structure within ovary of plant that contains egg cells






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






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. Small - dense region within most nuclei in which the assembly of RNA proteins begins






9. 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






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






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






12. Modifications of pre-mRNA that make it into mature mRNA - so that it is ready for protein synthesis






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






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






15. Particle made up of DNA - RNA - protein - and in some cases lipids that can only replicate only by infecting living cells






16. Stores - packages and ships proteins






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






18. A substance that retards or stops enzymatic activity






19. Projections on cell membrane increase surface area






20. Used to examine tiny cell organelles






21. The final stage of mitosis or meiosis - during which a nuclear membrane forms around each set of new chromosomes






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






23. The organic process whereby the DNA sequence in a gene is copied into mRNA






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






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






26. Smallest unit of most living things






27. Sticky portion at the top of the style which traps pollen






28. A substance that must join with the enzyme to enable it to fit the substrate






29. The complete genetic material contained in an individual






30. Provides structural support to a cell composed of microtubules - microfilaments - centrioles






31. Change in a DNA sequence that affects genetic information






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






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






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






35. In photosynthesis - this is the splitting of water by light






36. The part of an enzyme where the chemical reaction occurs






37. Packaged protein or other substance produced by golgi apparatus/endoplasmic reticulum






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






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






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






41. First step in releasing the energy of glucose - in which a molecule of glucose is broken into two molecules of pyruvic acid






42. Classification of plant whose life cycle survives two seasons






43. The part of the stamen that contains pollen






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






45. Body of a chloroplast containing grana






46. Two identical chromosomes that split and contain the same genetic material






47. Classification of plant which survives only a single season






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






49. Process of building up complex materials (proteins) from simple materials






50. Small structures in the cytoplasm of a cell that do special jobs







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