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






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






3. Classification of plant which survives only a single season






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






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






6. Used to examine tiny cell organelles






7. Stores - packages and ships proteins






8. Stalk that supports the flower






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






10. Uses electrons from the Krebs cycle to change ADP to ATP (cytochromes on surface of cristae of mitochondria - contain protein and heme (iron containing) groups - electrons pass along them and ATP is produced)






11. The substance acted upon by an enzyme






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






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






14. The part of the stamen that contains pollen






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






16. The male reproductive organ of a flower consisting of anther - filament - and pollen






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






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






19. The stalk of a stamen that supports the anther






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






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






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






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






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






25. Cell division which produces two identical cells






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






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






28. Proteins that act as biological catalysts






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






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






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






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






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






34. Stage of cellular respiration that finishes the breakdown of pyruvic acid molecules to carbon dioxide - releasing energy






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






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






37. Different forms of a gene






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






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






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






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






42. Living thing






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






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






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






46. A cell having only one complete set of chromosomes






47. Body of a chloroplast containing grana






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






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






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