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






2. The stalk of a stamen that supports the anther






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






4. Smallest unit of most living things






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






6. Classification of plant whose life cycle survives two seasons






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






8. Matching Chromosomes that are similar but not identical






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






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






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






12. Change in a DNA sequence that affects genetic information






13. 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






14. Stores - packages and ships proteins






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






16. Plants that grow year after year






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






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






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






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






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






22. Consists of DNA tightly coiled around proteins






23. 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)






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






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






26. Living thing






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






28. Cell division which produces two identical cells






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






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






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






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






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






34. Green pigment contained in the grana






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






36. The part of the stamen that contains pollen






37. Used to examine tiny cell organelles






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






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






40. Structure within ovary of plant that contains egg cells






41. Vacuole membrane






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






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






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






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






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






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






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






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






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