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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. Membrane-bound organelle that stores water and soluble substances






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






3. The part of the stamen that contains pollen






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






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






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






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






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






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






10. Body of a chloroplast containing grana






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






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






13. Classification of plant which survives only a single season






14. Smallest unit of most living things






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






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






17. Different forms of a gene






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






19. 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)






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






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






22. Classification of plant whose life cycle survives two seasons






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






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






25. Living thing






26. The substance acted upon by an enzyme






27. Production of a chemical compound by a living organism






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






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






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






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






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






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






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






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






36. 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






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






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






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






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






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






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






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






44. The complete genetic material contained in an individual






45. Cell division which produces two identical cells






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






47. The stalk of a stamen that supports the anther






48. Stalk that supports the flower






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






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