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






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






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






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






5. Cell division which produces two identical cells






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






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






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






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






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






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






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






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






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






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






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






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






18. The stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle






19. 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)






20. Smallest unit of most living things






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






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






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






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






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






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






27. Classification of plant which survives only a single season






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






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






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






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






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






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






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






35. Vacuole membrane






36. Proteins that act as biological catalysts






37. Used to examine tiny cell organelles






38. Matching Chromosomes that are similar but not identical






39. Area where the chromatids of a chromosome are attached






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






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






42. The stalk of a stamen that supports the anther






43. The complete genetic material contained in an individual






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






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






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






47. A cell having only one complete set of chromosomes






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






49. 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






50. Plants that grow year after year