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






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






3. Green pigment contained in the grana






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






5. Vacuole membrane






6. The stalk of a stamen that supports the anther






7. Stores - packages and ships proteins






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






9. Structure within ovary of plant that contains egg cells






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






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






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






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






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






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






16. Hollow tubes of protein about 25 nanometers in diameter - support the cell and moves organelles within the cell






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






18. Classification of plant which survives only a single season






19. Packaged protein or other substance produced by golgi apparatus/endoplasmic reticulum






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






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






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






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






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






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






26. Matching Chromosomes that are similar but not identical






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






28. Different forms of a gene






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






30. Body of a chloroplast containing grana






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






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






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






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






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






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






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






38. Projections on cell membrane increase surface area






39. Smallest unit of most living things






40. Plants that grow year after year






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






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






43. Production of a chemical compound by a living organism






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






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






46. A substance that retards or stops enzymatic activity






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






48. A cell having only one complete set of chromosomes






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






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