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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. Modification of a cell by the incorporation of exogenous DNA






2. Consists of DNA tightly coiled around proteins






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






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






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






6. The substance acted upon by an enzyme






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






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






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






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






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






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






13. Area where the chromatids of a chromosome are attached






14. Living thing






15. Matching Chromosomes that are similar but not identical






16. 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






17. Process by which a cell releases large amounts of material






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






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






20. Classification of plant which survives only a single season






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






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






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






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






25. Vacuole membrane






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






27. Smallest unit of most living things






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






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






30. A substance that retards or stops enzymatic activity






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






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






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






34. Used to examine tiny cell organelles






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






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






37. The part of the stamen that contains pollen






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






39. Different forms of a gene






40. 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)






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






42. Stalk that supports the flower






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






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






45. Body of a chloroplast containing grana






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






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






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






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






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