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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. 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)






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






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






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






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






6. Composed of a bilayer of lipids embedded with globular proteins






7. 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






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






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






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






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






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






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






14. Structure within ovary of plant that contains egg cells






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






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






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






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






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






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






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






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






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






24. Consists of DNA tightly coiled around proteins






25. Proteins that act as biological catalysts






26. Area where the chromatids of a chromosome are attached






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






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






29. Classification of plant which survives only a single season






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






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






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






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






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






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






36. The substance acted upon by an enzyme






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






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






39. A cell having only one complete set of chromosomes






40. A substance that retards or stops enzymatic activity






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






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






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






44. Green pigment contained in the grana






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






46. Smallest unit of most living things






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






48. Classification of plant whose life cycle survives two seasons






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






50. Vacuole membrane