3. A carbon atom of mass number 12 and a carbon atom of mass number 14 are A) co

Question

3. A carbon atom of mass number 12 and a carbon atom of mass number 14 are

            A) covalent     B) compounds       C) ions      D) isotopes

4. A chlorine atom has 17 protons, 18 neutrons, and 17 electrons. The atomic number of

            chlorine is       A) 8     B) 17     C) 35      D) 52

5. If you place the probe of a pH meter in lye or sodium hydroxide (NaOH), it will read

            pH 14. Sodium hydroxide is     A) an acid     B) neutral        C) a base   

6. This polysaccharide forms fibers that are a major component of plant cell walls:

            A) glucose    B) starch    C) cellulose D) glycogen  

7. Glycerol is a building block of    A) starch B) enzymes   C) vegetable oil   D) DNA

8. Which of these types of molecules contain nitrogen?

            A) polysaccharides    B) proteins      C) phospholipids

9. Prokaryotic cells, with no nucleus or membranous organelles, are found in

            A) animals     B) bacteria    C) fungi     D) plants

10. The main function of a ribosome is to A) extract energy from glucose

            B) synthesize glucose                  C) store food in the form of fat

            D) synthesize proteins

11. Mitochondria    A) package proteins for secretion from cell   B) contain chromosomes

            C) are sites of oxidation of glucose to generate ATP    D) synthesize proteins

12. The plasma membrane consists of     A) a single layer of phospholipid molecules

          B) a double layer of phospholipid molecules in which proteins are embedded

          C) several layers of protein and carbohydrate molecules

            D) a triple layer of phospholipids and carbohydrates

13. The movement of molecules from a region of low concentration across a membrane

            to a region of high concentration by use of ATP energy is   A) active transport

            B) diffusion   C) passive transport   D) osmosis

14. The oxygen in our atmosphere is produced by    A) greenhouse effect  

            B) cellular respiration   C) photosynthesis   D) volcanic eruptions

15. Yeast cells break down glucose anaerobically into

            A) ethanol and CO2               B) lactic acid and CO2  

            C) lactic acid and H2O            D) ethanol and H2O

16. The net energy gain from complete cellular respiration is

            A) 2 ATP     B) 4 ATP    C) 8 ATP    D) 36-38 ATP   

17. Carbon dioxide is released in   A) the light-dependent phase of photosynthesis

            B) the Krebs cycle        C) glycolysis      D) the Calvin cycle

18. If the concentration of glucose in the water outside of a cell is lower than the

            concentration inside,    A) water will tend to enter the cell by osmosis         B) water will

            tend to leave the cell by osmosis   C) glucose will tend to enter the cell by osmosis            D) glucose will tend to leave the cell by osmosis

19. What happens if a red blood cell is placed in a hypotonic solution?

            A) the cell will shrink     B) the cell will swell and may burst

            C) the cell will remain the same size

Explanation / Answer

3) isotopes

4) 17

5) its a base

6) cellulose

7)vegetable oils

8) proteins

9) bacteria

10) make proteins from mRNA

11) it has circular chromosome

12) double layer with proteins embedded

13) osmosis

14)photosynthesis

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