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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. Classification of plant which survives only a single season






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






3. (adenosine triphosphate) main energy source that cells use for most of their work






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






5. Consists of DNA tightly coiled around proteins






6. 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)






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






8. The substance acted upon by an enzyme






9. Stores - packages and ships proteins






10. Body of a chloroplast containing grana






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






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






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






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






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






16. Matching Chromosomes that are similar but not identical






17. Change in a DNA sequence that affects genetic information






18. The part of the stamen that contains pollen






19. Plants that grow year after year






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






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






22. 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






23. Passive transport of materials across a plasma membrane by transport proteins embedded in the plasma membrane






24. The stalk of a stamen that supports the anther






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






26. Process of building up complex materials (proteins) from simple materials






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






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






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






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






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






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






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






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






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






36. Living thing






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






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






39. Production of a chemical compound by a living organism






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






41. A cell having only one complete set of chromosomes






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






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






44. Classification of plant whose life cycle survives two seasons






45. Vacuole membrane






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






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






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






49. Proteins that act as biological catalysts






50. Used to examine tiny cell organelles