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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. Proteins that act as biological catalysts






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






3. Projections on cell membrane increase surface area






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






5. Vacuole membrane






6. Matching Chromosomes that are similar but not identical






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






8. Stalk that supports the flower






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






10. Body of a chloroplast containing grana






11. Classification of plant which forms seeds inside a protective chamber called an ovary - inside a flower






12. A substance that retards or stops enzymatic activity






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






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






15. Used to examine tiny cell organelles






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






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






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






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






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






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






22. Smallest unit of most living things






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






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






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






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






27. The substance acted upon by an enzyme






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






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






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






31. Consists of DNA tightly coiled around proteins






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






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






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






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






36. Area where the chromatids of a chromosome are attached






37. Stores - packages and ships proteins






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






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






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






41. The part of the stamen that contains pollen






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






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






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






45. 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)






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






47. Green pigment contained in the grana






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






49. Classification of plant whose life cycle survives two seasons






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