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






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






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






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






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






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






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






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






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






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






11. A substance that retards or stops enzymatic activity






12. Classification of plant which survives only a single season






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






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






15. Structure within ovary of plant that contains egg cells






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






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






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






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






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






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






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






24. The stalk of a stamen that supports the anther






25. Plants that grow year after year






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






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






28. Production of a chemical compound by a living organism






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






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






31. Classification of plant whose life cycle survives two seasons






32. Area where the chromatids of a chromosome are attached






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






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






35. 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)






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






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






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






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






40. Smallest unit of most living things






41. Packaged protein or other substance produced by golgi apparatus/endoplasmic reticulum






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






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






44. Green pigment contained in the grana






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






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






47. Body of a chloroplast containing grana






48. Projections on cell membrane increase surface area






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






50. Stalk that supports the flower