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






2. 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






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






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






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






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






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






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






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






10. The complete genetic material contained in an individual






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






12. Body of a chloroplast containing grana






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






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






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






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






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






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






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






20. Living thing






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






22. The part of the stamen that contains pollen






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






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






25. Modification of a cell by the incorporation of exogenous DNA






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






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






28. The substance acted upon by an enzyme






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






30. Plants that grow year after year






31. Area where the chromatids of a chromosome are attached






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






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






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






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






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






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






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






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






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






41. Used to examine tiny cell organelles






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






43. Smallest unit of most living things






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






45. Different forms of a gene






46. Cell division which produces two identical cells






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






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






49. A cell having only one complete set of chromosomes






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