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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. Cell division that produces reproductive cells in sexually reproducing organisms






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






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






4. Cell division which produces two identical cells






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






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






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






8. The part of the stamen that contains pollen






9. Body of a chloroplast containing grana






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






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






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






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






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






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






16. Classification of plant which survives only a single season






17. 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)






18. Plants that grow year after year






19. Consists of DNA tightly coiled around proteins






20. Structure within ovary of plant that contains egg cells






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






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






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






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






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






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






27. Change in a DNA sequence that affects genetic information






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






29. A cell having only one complete set of chromosomes






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






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






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






33. Different forms of a gene






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






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






36. Production of a chemical compound by a living organism






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






38. Three-nucleotide sequence on messenger RNA that codes for a single amino acid






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






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






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






42. Area where the chromatids of a chromosome are attached






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






44. Green pigment contained in the grana






45. A substance that retards or stops enzymatic activity






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






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






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






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






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