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






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






3. Different forms of a gene






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






5. Area where the chromatids of a chromosome are attached






6. Living thing






7. Structure within ovary of plant that contains egg cells






8. 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






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






10. Production of a chemical compound by a living organism






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






12. Body of a chloroplast containing grana






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






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






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






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






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






18. Vacuole membrane






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






20. The part of the stamen that contains pollen






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






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






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






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






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






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






27. Stores - packages and ships proteins






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. Stalk that supports the flower






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






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






32. Smallest unit of most living things






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






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






35. The substance acted upon by an enzyme






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






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






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






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






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






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






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






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






44. Projections on cell membrane increase surface area






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






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






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






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






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






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