1. In the clotting of blood, platelets adhere to the wound and release chemicals

Question

1. In the clotting of blood, platelets adhere to the wound and release chemicals which cause additional platelets to adhere to wound. Is this an example of negative or positive feedback? 2. The tendency for the body to maintain a stable internal condition is called a. Differentiation b. Metabolism c. Organization d. Homeostasis Which type of bond involves the unequal sharing of electrons? a. lonic b. Nonpolar Covalent c. Polar Covalent d. Hydrogen 4. Adding HCI to a water solution results in an increase in pH. Circle: True or False 5. A solution with pH4 has 6. times the H+ concentration of a solution with pH 6 Which class of organic molecules contains carbon, hydrogen, and very little oxygen. a. Carbohydrates b. Lipid c. Proteins d. Nucleic Acids 7-10. Match the macromolecule with the correct building block that forms it (May use an answer more than once & an answer may have more than one correct choice). Glycogen Triglyceride Sucrose Peptide (A) Glucose (B) Fatty Acid (C) Amino Acid (D) Glycerol 11. The majority of the plasma membrane is composed of a bilayer of The transport of solutes from an area of lower concentration to an area of greater 12. concentration is due to b. Active Transport c. Endocytosis d. Osmosis a. Simple Diffusion 13.- Which type of carrier moves two solutes through a plasma membrane in the opposite directions at the same time? a. Uniport b. Symport c. Antiport Questions 14-17. Match the following substances with the mechanisms of transport across the cell membrane into a cell (May use an answer more than once, but each has only 1 correct response). 14. Bacteria 15. Steroid Hormones 16. Amino Acids 17. Chloride lon (A) Simple Diffusion (B) Facilitated Diffusion (C) Phagocytosis (D) Primary Active Transport 18. DNA is a nucleic acid which is a polymer of nucleotides. Nucleotides are composed of a carbohydrate, phosphate group, and

Explanation / Answer

1. Positive feedback loop

2. d. Homeostasis

3. c Polar covalent bond

4. False (pH of water is 7, when you add HCl its pH will less than 7 so decreased.)

5. 100

6. d. nucleic acid

7-10.

Glycogen - Glucose

triglyceride - fatty acid and glycerol

sucrose - Glucose

Peptide - Amino acid

11. phospholipid

12. Active transport

13. Antiport

14.

Bacteria: phagocytosis

steroid hormones: simple diffusion

amino acid: Facilitated diffusion

chloride ion: primary active transport

18.

nitrogenous base is either a purine or a pyrimidine

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