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






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






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






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






5. Stores - packages and ships proteins






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






7. Plants that grow year after year






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






9. The complete genetic material contained in an individual






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






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






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






13. Structure within ovary of plant that contains egg cells






14. 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)






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






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






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






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






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






20. The substance acted upon by an enzyme






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






22. The part of the stamen that contains pollen






23. Smallest unit of most living things






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






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






26. Used to examine tiny cell organelles






27. 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






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






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






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






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






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






33. Different forms of a gene






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






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






36. Classification of plant whose life cycle survives two seasons






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






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






39. Change in a DNA sequence that affects genetic information






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






41. Proteins that act as biological catalysts






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






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






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






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






46. A cell having only one complete set of chromosomes






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






48. Stalk that supports the flower






49. A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix






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