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






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






3. Smallest unit of most living things






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






5. Body of a chloroplast containing grana






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






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






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






9. Projections on cell membrane increase surface area






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






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






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






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






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






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






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






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






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






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






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






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






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






23. Classification of plant which survives only a single season






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






25. Cell division which produces two identical cells






26. Proteins that act as biological catalysts






27. Area where the chromatids of a chromosome are attached






28. The substance acted upon by an enzyme






29. Site of protein synthesis. Free ribosomes - float unattached; attached ribosomes - attached to the ER






30. Matching Chromosomes that are similar but not identical






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






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






33. Production of a chemical compound by a living organism






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






35. Consists of DNA tightly coiled around proteins






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






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






38. A substance that retards or stops enzymatic activity






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






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






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






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






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






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






45. Plants that grow year after year






46. A cell having only one complete set of chromosomes






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






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






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






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






Can you answer 50 questions in 15 minutes?



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