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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 regular sequence of growth and division that cells undergo






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






3. A substance that retards or stops enzymatic activity






4. Different forms of a gene






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






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






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






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






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






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






11. A cell having only one complete set of chromosomes






12. Stalk that supports the flower






13. Green pigment contained in the grana






14. 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)






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






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






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






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






19. Structure within ovary of plant that contains egg cells






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






21. Classification of plant which survives only a single season






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






23. Smallest unit of most living things






24. Stores - packages and ships proteins






25. Consists of DNA tightly coiled around proteins






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






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






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






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






30. Change in a DNA sequence that affects genetic information






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






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






33. Cell division which produces two identical cells






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






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






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






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






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






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






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






41. Living thing






42. Classification of plant whose life cycle survives two seasons






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






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






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






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






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






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






49. Area where the chromatids of a chromosome are attached






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