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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 interchange of sections between pairing homologous chromosomes during the prophase of meiosis






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






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






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






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






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






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






8. Proteins that act as biological catalysts






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






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






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






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






13. Change in a DNA sequence that affects genetic information






14. Classification of plant which survives only a single season






15. Have tissues made of cells that transport water and nutrients throughout the plant






16. Vacuole membrane






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






34. Matching Chromosomes that are similar but not identical






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






36. A cell having only one complete set of chromosomes






37. 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)






38. 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






39. The complete genetic material contained in an individual






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






41. The part of the stamen that contains pollen






42. Projections on cell membrane increase surface area






43. Cell division which produces two identical cells






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






45. Different forms of a gene






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






47. Smallest unit of most living things






48. Structure within ovary of plant that contains egg cells






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






50. A substance that retards or stops enzymatic activity