Test your basic knowledge |

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. Consists of DNA tightly coiled around proteins






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






3. Area where the chromatids of a chromosome are attached






4. Cell division which produces two identical cells






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






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






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






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






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






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






11. Provides structural support to a cell composed of microtubules - microfilaments - centrioles






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






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






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






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






16. Used to examine tiny cell organelles






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






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






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






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






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






22. The substance acted upon by an enzyme






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






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






25. Classification of plant whose life cycle survives two seasons






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






27. A cell having only one complete set of chromosomes






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






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






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






31. Different forms of a gene






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






33. Body of a chloroplast containing grana






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






35. The part of the stamen that contains pollen






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






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






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






39. Stalk that supports the flower






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






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






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






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






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






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






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






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






48. Production of a chemical compound by a living organism






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






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