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






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






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






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






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






6. 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)






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






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






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






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






11. Change in a DNA sequence that affects genetic information






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






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






14. Plants that grow year after year






15. The substance acted upon by an enzyme






16. The complete genetic material contained in an individual






17. The stalk of a stamen that supports the anther






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






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






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






21. The organ that bears the ovules of a flower - base of the pistil






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






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






24. Area where the chromatids of a chromosome are attached






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






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






27. Body of a chloroplast containing grana






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






29. 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






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






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






32. A substance that retards or stops enzymatic activity






33. Consists of DNA tightly coiled around proteins






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






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






36. Projections on cell membrane increase surface area






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






38. Living thing






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






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






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






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






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






44. Different forms of a gene






45. Production of a chemical compound by a living organism






46. Proteins that act as biological catalysts






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






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






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






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