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






2. Process by which a cell releases large amounts of material






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






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






5. Classification of plant whose life cycle survives two seasons






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






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






8. The complete genetic material contained in an individual






9. Matching Chromosomes that are similar but not identical






10. Plants that grow year after year






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






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






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. Change in a DNA sequence that affects genetic information






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






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






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






18. Smallest unit of most living things






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






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






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






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






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






24. Area where the chromatids of a chromosome are attached






25. Proteins that act as biological catalysts






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






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






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






29. Production of a chemical compound by a living organism






30. Green pigment contained in the grana






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






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






33. Classification of plant which survives only a single season






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






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






36. Consists of DNA tightly coiled around proteins






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






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






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






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






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






42. Body of a chloroplast containing grana






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






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






45. The substance acted upon by an enzyme






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






47. 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






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






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






50. Living thing