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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. The stalk of a stamen that supports the anther






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






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






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






5. Stalk that supports the flower






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






7. Different forms of a gene






8. Classification of plant whose life cycle survives two seasons






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






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






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






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






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






14. Cell division that produces reproductive cells in sexually reproducing organisms






15. Production of a chemical compound by a living organism






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






17. A cell having only one complete set of chromosomes






18. Classification of plant which survives only a single season






19. Projections on cell membrane increase surface area






20. Structure within ovary of plant that contains egg cells






21. Matching Chromosomes that are similar but not identical






22. Living thing






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






24. A substance that retards or stops enzymatic activity






25. Body of a chloroplast containing grana






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






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






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






29. The process of transfering genetic material from one cell to another






30. Smallest unit of most living things






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






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






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






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






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






36. Vacuole membrane






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






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






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






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






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






42. 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






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






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






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






46. Green pigment contained in the grana






47. Proteins that act as biological catalysts






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






49. Change in a DNA sequence that affects genetic information






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







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