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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. Composed of a bilayer of lipids embedded with globular proteins






2. Used to examine tiny cell organelles






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






4. Proteins that act as biological catalysts






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






6. Classication of plant which produce seeds which are 'naked' (in cones)






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






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






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






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






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






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






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






14. Division of the cytoplasm during cell division - new cell is formed






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






16. A substance that retards or stops enzymatic activity






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






18. Modification of a cell by the incorporation of exogenous DNA






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






20. 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






21. Area where the chromatids of a chromosome are attached






22. The first stage of mitosis - forming spindle fibres attached to the centromere






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






24. Passive transport of materials across a plasma membrane by transport proteins embedded in the plasma membrane






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






26. Transport of a substance across a cell membrane against the concentration gradient






27. The stalk of a stamen that supports the anther






28. A period during which the cell grows - G1 - copies its DNA - S - and synthesizes proteins - G2






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






30. Classification of plant whose life cycle survives two seasons






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






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






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






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






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






36. Disk-like plates which are the site of photosynthesis in chloroplasts






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






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






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






40. Stalk that supports the flower






41. A cell having only one complete set of chromosomes






42. Cell organelle filled with enyzmes need to break down certain materials in the cells






43. Numerous folds in the inner membrane of a mitochondrion - the site of cellular respiration






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






45. Matching Chromosomes that are similar but not identical






46. Body of a chloroplast containing grana






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






48. The process whereby genetic information coded in messenger RNA directs the formation of a specific protein at a ribosome in the cytoplasm through tRNA






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






50. Anaerobic cellular respiration in which pyruvic acid is broken down into end products such as lactic acid