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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. Projections on cell membrane increase surface area






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






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






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






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






6. The part of the stamen that contains pollen






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






8. Small - dense region within most nuclei in which the assembly of RNA proteins begins






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






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






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






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






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






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






15. Structure within ovary of plant that contains egg cells






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






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






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






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






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






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






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






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






24. A cell having only one complete set of chromosomes






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






26. 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)






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






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






29. Green pigment contained in the grana






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






31. Consists of DNA tightly coiled around proteins






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






33. Used to examine tiny cell organelles






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






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






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






37. Production of a chemical compound by a living organism






38. Smallest unit of most living things






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






40. Plants that grow year after year






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






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






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






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






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






46. Area where the chromatids of a chromosome are attached






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






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






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






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






Can you answer 50 questions in 15 minutes?



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