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






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






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






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






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






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






7. A substance that retards or stops enzymatic activity






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






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






10. Used to examine tiny cell organelles






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






12. The complete genetic material contained in an individual






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






14. The part of the stamen that contains pollen






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






16. Change in a DNA sequence that affects genetic information






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






18. Different forms of a gene






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






20. Proteins that act as biological catalysts






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






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






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






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






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






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






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






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






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. A cell having two sets of chromosomes or twice the haploid number






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






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






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






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






35. Classification of plant whose life cycle survives two seasons






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






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






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






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






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






41. Stalk that supports the flower






42. A cell having only one complete set of chromosomes






43. Area where the chromatids of a chromosome are attached






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






45. Consists of DNA tightly coiled around proteins






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






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






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






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






50. Body of a chloroplast containing grana







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