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






2. A cell having only one complete set of chromosomes






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






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






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






6. Projections on cell membrane increase surface area






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






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






9. Cell division which produces two identical cells






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






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






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






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






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






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






16. Living thing






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






18. Proteins that act as biological catalysts






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






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






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






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






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






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






25. Matching Chromosomes that are similar but not identical






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






27. Area where the chromatids of a chromosome are attached






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






29. Production of a chemical compound by a living organism






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






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






32. Green pigment contained in the grana






33. Classification of plant which survives only a single season






34. Body of a chloroplast containing grana






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






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






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






38. Different forms of a gene






39. Plants that grow year after year






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






41. Vacuole membrane






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






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






44. Stores - packages and ships proteins






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






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






47. 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)






48. 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






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






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