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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. Transport of a substance across a cell membrane against the concentration gradient






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






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






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






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






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






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






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






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






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






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






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






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






14. Consists of DNA tightly coiled around proteins






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






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






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






18. Classification of plant whose life cycle survives two seasons






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






20. A substance that retards or stops enzymatic activity






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






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






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






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






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






26. Living thing






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






28. 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)






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






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






31. Smallest unit of most living things






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






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






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






35. Cell division which produces two identical cells






36. The complete genetic material contained in an individual






37. 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






38. Used to examine tiny cell organelles






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






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






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






42. Classification of plant which survives only a single season






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






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






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






46. The stalk of a stamen that supports the anther






47. A cell having only one complete set of chromosomes






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






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






50. Stores - packages and ships proteins