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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. The part of an enzyme where the chemical reaction occurs






2. Body of a chloroplast containing grana






3. A cell having only one complete set of chromosomes






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






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






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






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






8. Production of a chemical compound by a living organism






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






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






11. Formed when cell membrane surrounds a molecule outside the cell and ingests it






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






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






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






15. Area where the chromatids of a chromosome are attached






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






17. Sequence of DNA that codes for a protein and thus determines a trait






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






19. Matching Chromosomes that are similar but not identical






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






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






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






23. Living thing






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






25. Plants that grow year after year






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






27. 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)






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






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






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






31. 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






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






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






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






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






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






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






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






39. Different forms of a gene






40. Stores - packages and ships proteins






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






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






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






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






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






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






47. Stalk that supports the flower






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






49. Used to examine tiny cell organelles






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







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