HW #4 - Biology Honors Prentice Hall Textbook by...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology Honors Prentice Hall Textbook by Miller/Levine Chapter 8 pg. 217 #1-30 + pg. 219 #1-9 9/27/09 period 2 1. B 2. B 3. B 4. D 5. C 6. A 7. D 8. A 9. B 10. A 11. Autotrophs make their own food by using light the sun. (ex: plants) Heterotrophs obtain energy from the foods they consume (ex: animals) 12. ATP consists of adenine, a 5-carbon sugar called ribose, and three phosphate groups. When the bond between the second and third phosphate group breaks, energy is released. 13. ATP can be compared to a fully charged battery because both ATP and ADP contain stored energy; whereas ADP resembles a partially charged battery because in order to use the energy, it has to add an extra “charge” of glucose. 14. ATP is used as immediate energy and is very short-term and glucose is more of a storage and can be added to ADP to create ATP. 15. Priestley determined that plants release oxygen, which can keep a candle burning. Igenhousz concluded that plants need sunlight to produce oxygen. Both scientists focused on plants releasing/producing oxygen. 16. 6CO2 + 6 H2O = (with light) C6H12O6 + 6O2 carbon dioxide + water light sugars + oxygen 17. In addition to water and carbon dioxide, photosynthesis requires light and chlorophyll. Plants gather the sun’s energy with light- absorbing molecules called pigments. The plants’ principal pigment is chlorophyll. There are two main types of chlorophyll: chlorophyll a and chlorophyll b 18. A is the chloroplast. B is the stroma; the region outside the thylakoid membranes. C is a granum, a stack of thylakoids. D is a photosystem, a cluster of pigment and protein that absorbs light energy and is found in saclike photosynthetic membranes called thylakoids. The Calvin cycle takes place in the stroma. 19. NADP (nicotinamide adenine dinucleotide phosphate) accepts and holds 2 high-energy electrons along with a hydrogen ion. This converts the NADP into NADPH. The conversion of NADP into NADPH is one way in which some of the energy of sunlight can be trapped in chemical form. The NADPH can then carry high-energy electrons produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell. These high-energy electrons build a variety of molecules the cell needs, including carbohydrates like glucose. 20. Hydrogen ions cannot cross the membrane directly. So the cell membrane contains a protein called ATP synthase that spanse the membrane and allows hydrogen ions to pass through it. As hydrogen ions pass through ATP synthase, the protein rotates like a turbine being spun by water
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
in a hydroelectric power plant. As it rotates, ATP synthase binds ADP and a phosphate group together to produce ATP.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

HW #4 - Biology Honors Prentice Hall Textbook by...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online