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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. Body of a chloroplast containing grana






2. Matching Chromosomes that are similar but not identical






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






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






5. Composed of a bilayer of lipids embedded with globular proteins






6. Smallest unit of most living things






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






8. Area where the chromatids of a chromosome are attached






9. Living thing






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






11. The stalk of a stamen that supports the anther






12. Used to examine tiny cell organelles






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






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






15. The substance acted upon by an enzyme






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






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






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






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






20. Change in a DNA sequence that affects genetic information






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






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






23. Projections on cell membrane increase surface area






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






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






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






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






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






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






30. Cell division which produces two identical cells






31. Theory which suggests mitochondria and chloroplasts were once prokaryotic organisms in a symbiotic relationship with eykorytic cells






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






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






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






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






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






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






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






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






40. Vacuole membrane






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






42. 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






43. Stores - packages and ships proteins






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






45. Structure within ovary of plant that contains egg cells






46. Classification of plant whose life cycle survives two seasons






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






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






49. Proteins that act as biological catalysts






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