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






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






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






4. Classification of plant whose life cycle survives two seasons






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






6. Used to examine tiny cell organelles






7. Projections on cell membrane increase surface area






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






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






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






11. Smallest unit of most living things






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






13. 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)






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






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






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






17. A substance that retards or stops enzymatic activity






18. The complete genetic material contained in an individual






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






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






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






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






23. Green pigment contained in the grana






24. Body of a chloroplast containing grana






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






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






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






28. The stalk of a stamen that supports the anther






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






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






31. Classification of plant which survives only a single season






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






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






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






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






36. Classification of plant which forms seeds inside a protective chamber called an ovary - inside a flower






37. Change in a DNA sequence that affects genetic information






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






39. Matching Chromosomes that are similar but not identical






40. Plants that grow year after year






41. Division of the cytoplasm during cell division - new cell is formed






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






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






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






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






46. The part of the stamen that contains pollen






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






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






49. A cell having only one complete set of chromosomes






50. The process whereby genetic information coded in messenger RNA directs the formation of a specific protein at a ribosome in the cytoplasm through tRNA







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