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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. Division of the cytoplasm during cell division - new cell is formed






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






3. Smallest unit of most living things






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






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






6. Different forms of a gene






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






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






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






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






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






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






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






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






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






16. The stalk of a stamen that supports the anther






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






18. Projections on cell membrane increase surface area






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






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






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






22. Body of a chloroplast containing grana






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






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






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






26. Plants that grow year after year






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






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






29. Structure within ovary of plant that contains egg cells






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






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






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






33. The part of the stamen that contains pollen






34. Area where the chromatids of a chromosome are attached






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






36. The complete genetic material contained in an individual






37. 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)






38. 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






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






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






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






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






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






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






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






46. Living thing






47. Proteins that act as biological catalysts






48. Classification of plant which survives only a single season






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






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






Can you answer 50 questions in 15 minutes?



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