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CLEP Natural Science

Subjects : clep, science
Instructions:
  • Answer 50 questions in 30 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. Smallest unit of most living things






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






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






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






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






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






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






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






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






10. The stalk of a stamen that supports the anther






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






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






13. Cell division which produces two identical cells






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






15. 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)






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






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






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






19. The complete genetic material contained in an individual






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






21. Proteins that act as biological catalysts






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






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






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






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






26. Change in a DNA sequence that affects genetic information






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






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






29. The substance acted upon by an enzyme






30. Area where the chromatids of a chromosome are attached






31. Body of a chloroplast containing grana






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






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






34. A substance that retards or stops enzymatic activity






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






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






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






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






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






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






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






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






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






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






45. Different forms of a gene






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






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






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






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






50. Classification of plant which survives only a single season






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