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






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






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






4. Cell division which produces two identical cells






5. Consists of DNA tightly coiled around proteins






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






7. 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)






8. The complete genetic material contained in an individual






9. Structure within ovary of plant that contains egg cells






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






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






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






13. Projections on cell membrane increase surface area






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






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






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






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






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






19. The stalk of a stamen that supports the anther






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






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






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






23. Plants that grow year after year






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






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






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






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






28. Classification of plant which survives only a single season






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






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






31. Production of a chemical compound by a living organism






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






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






34. Different forms of a gene






35. Area where the chromatids of a chromosome are attached






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






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






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






39. Green pigment contained in the grana






40. Living thing






41. A cell having only one complete set of chromosomes






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






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






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






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






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






47. Vacuole membrane






48. The part of the stamen that contains pollen






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






50. 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