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






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






3. Green pigment contained in the grana






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






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






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






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






8. Vacuole membrane






9. Change in a DNA sequence that affects genetic information






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






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






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






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






14. 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






15. A substance that retards or stops enzymatic activity






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






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






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






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






20. Matching Chromosomes that are similar but not identical






21. Smallest unit of most living things






22. Used to examine tiny cell organelles






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






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






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






26. Production of a chemical compound by a living organism






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






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






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






30. Classification of plant whose life cycle survives two seasons






31. 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)






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






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






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






35. The stalk of a stamen that supports the anther






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






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






38. Area where the chromatids of a chromosome are attached






39. Projections on cell membrane increase surface area






40. Cell division which produces two identical cells






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






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






43. Plants that grow year after year






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






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






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






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






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






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






50. The substance acted upon by an enzyme