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






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






3. Projections on cell membrane increase surface area






4. Structure within ovary of plant that contains egg cells






5. The substance acted upon by an enzyme






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






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






8. A substance that retards or stops enzymatic activity






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






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






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






12. Production of a chemical compound by a living organism






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






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






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






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






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






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






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






20. A cell having only one complete set of chromosomes






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






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






23. Vacuole membrane






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






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






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






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






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






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






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






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






32. Cell division which produces two identical cells






33. Change in a DNA sequence that affects genetic information






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






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






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






37. Used to examine tiny cell organelles






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






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






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






41. Proteins that act as biological catalysts






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






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






44. Consists of DNA tightly coiled around proteins






45. 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






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






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






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






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






50. Stores - packages and ships proteins