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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. Classification of plant which survives only a single season






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






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






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






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






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






7. Projections on cell membrane increase surface area






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






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






10. Classification of plant whose life cycle survives two seasons






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






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






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






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






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






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






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






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






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






20. Living thing






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






22. Stores - packages and ships proteins






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






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






25. Smallest unit of most living things






26. Proteins that act as biological catalysts






27. Production of a chemical compound by a living organism






28. Cell division which produces two identical cells






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






30. Transport of a substance across a cell membrane against the concentration gradient






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






32. Powerhouse of the cell - organelle that is the site of ATP (energy) production






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






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






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






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






37. The complete genetic material contained in an individual






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






39. Green pigment contained in the grana






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






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






42. Consists of DNA tightly coiled around proteins






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






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






45. Vacuole membrane






46. Structure within ovary of plant that contains egg cells






47. A cell having only one complete set of chromosomes






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






49. A substance that retards or stops enzymatic activity






50. The stalk of a stamen that supports the anther