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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. Stores - packages and ships proteins






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






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






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






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






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






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






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






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






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






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






12. Change in a DNA sequence that affects genetic information






13. Numerous folds in the inner membrane of a mitochondrion - the site of cellular respiration






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






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






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






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






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






19. Living thing






20. Area where the chromatids of a chromosome are attached






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






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






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






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






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






26. Body of a chloroplast containing grana






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






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






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






30. The part of the stamen that contains pollen






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






32. The complete genetic material contained in an individual






33. Plants that grow year after year






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






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






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






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






38. A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix






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






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






41. 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






42. The substance acted upon by an enzyme






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






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






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






46. Classification of plant which survives only a single season






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






48. Different forms of a gene






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






50. Stalk that supports the flower