BIOL 2051 Chapter : Chapter 4 Notes

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15 Mar 2019

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Inorganic molecules are electron donors (iron: organotrophs, organic molecules are electron donors (glucose, ultimate electron acceptor. Inorganic molecules (nitrate and oxygen: respiration, organic molecules (pyruvate) Light energy excites electrons: excited molecules are electron donors, chemotrophs, chemicals are electron donors, oxidation of chemical, oxidation = donation of electrons, nutrients, macronutrients, major elements in cell macromolecules, c,h,o,n,p,s. Advantage: phototrophs - contain pigments that allow them to use light as energy. Advantage: carbon sources, heterotrophs - carbon source is organic compounds, autotrophs - carbon source is carbon dioxide. These terms can be combined to more completely describe an organism. Example- photoautotroph obtains energy from light & carbon from carbon dioxide. Nutrient uptake: passive diffusion, some substances pass freely through membranes, o2, co2, follows gradient of material, facilitated diffusion, transporters pass material into/out of cell, follows gradient of material. Glucose enters cells and is phosporylated becomes glucose 6 phosphate, as a result gradient puts more glucose into the cell.

Related Questions

1. Plants need which of the following to carry on photosynthesis?

a. H2O

b. CO2

c. O2

d. both O2 and CO2

e. both H2O and CO2

2. Organisms that derive their chemical energy either from the process of chemosynthesis or photosynthesis are classified as

a. autotrophs.

b. parasites.

c. heterotrophs.

d. saprophytes.

e. mutualists.

3. The carbon source for organisms that derive their energy from photosynthesis is

a. carbon monoxide.

b. carbon dioxide.

c. hydrocarbons.

d. methane.

e. glucose.

4. The oxygen released in photosynthesis comes from

a. carbon dioxide.

b. glucose.

c. ribulose bisphosphate.

d. water.

5. When chlorophyll a molecules absorb energy, the molecules

a. release electrons.

b. release X-rays.

c. release energy.

d. release electrons and X-rays.

e. release electrons and energy.

6. The flow of what particle across the thylakoid membrane powers the production of ATP?

a. electrons

b. hydrogen ions

c. oxygen

d. carbon dioxide

e. phosphate ions 2

7. The light-independent reactions were discovered by

a. M. D. Hatch.

b. Andrew Benson.

c. Melvin Calvin.

d. Robert Hill.

e. both Andrew Benson and Melvin Calvin.

8. For each six atoms of carbon dioxide fixed in the light-independent reactions, how many molecules of PGAL (phosphoglyceraldehyde) are produced?

a. 2

b. 3

c. 6

d. 12

e. 15

Chapter 7

9. The ultimate source of energy for living things is

a. the Krebs cycle.

b. fossil fuels.

c. the sun.

d. glycolysis.

e. aerobic respiration.

10. When molecules are broken apart in respiration

a. the heat produced is used to drive biological reactions.

b. the oxygen in the compounds that are broken apart is used as an energy source.

c. the energy released in respiration is channeled into molecules of ATP.

d. ATP is converted into ADP.

e. ADP is released as a waste product.

11. ATP

a. can be produced by photosynthesis.

b. is produced in the degradation of organic compounds such as glucose.

c. is generated in anaerobic respiration.

d. is released in aerobic respiration.

e. all of these

12. Which part of the energy-releasing pathway can convert all carbon that enters to carbon dioxide?

a. fermentation

b. glycolysis

c. Krebs cycle

d. electron transport

e. phosphorylation

13. Which liberates the most energy in the form of ATP?

a. aerobic respiration

b. anaerobic respiration

c. alcoholic fermentation

d. lactate fermentation

e. All liberate the same amount, but through different means.

14. Aerobes use ________ as the final electron acceptor in electron transport phosphorylation.

a. hydrogen

b. carbon

c. oxygen

d. H2O 3

15. Glycolysis depends on a continuous supply of

a. NADP.

b. pyruvate.

c. NAD+.

d. NADH.

e. H2O.

16. Glycolysis

a. occurs in the mitochondria.

b. results in the production of pyruvate.

c. occurs in the cytoplasm.

d. occurs in the mitochondria and results in the production of pyruvate.

e. results in the production of pyruvate and occurs in the cytoplasm.

17. The end product(s) of glycolysis is(are)

a. acetyl CoA.

b. carbon dioxide.

c. pyruvate.

d. glucose.

e. glucose and carbon dioxide.

18. Which is capable of being reduced during both glycolysis and the Krebs cycle?

a. NAD+

b. FAD+

c. ADP

d. NADH

e. NADP+

19. The Krebs cycle takes place in the

a. ribosomes.

b. cytoplasm.

c. nucleus.

d. mitochondria.

e. chloroplasts.

20. The breakdown of pyruvate in the Krebs cycle results in the release of

a. energy.

b. carbon dioxide.

c. oxygen.

d. energy and oxygen.

e. energy and carbon dioxide.

ochremole959

Multiple Choice

1. Which of the following describes lipids?

a source of nutrients for organisms â¨

energy-storage molecules â¨

molecules having structural role in membranes â¨

molecules that are part of hormones and pigments â¨

all of the above â¨

2. Molecules bearing both polar and nonpolar groups are said to be which of the following?

a. hydrophilicâ¨

b. amphipathic

c. hydrophobic

d. polyfunctional

3. By definition, carbohydrates contain which elements?

carbon and hydrogen â¨

carbon, hydrogen, and nitrogen â¨

carbon, hydrogen, and oxygen â¨

carbon and oxygen â¨

4. Monosaccharides may link together to form polysaccharides by forming which type of bond?

a. hydrogen

b. peptideâ¨

c. ionicâ¨

d. glycosidic

5. Which of the following is the name for molecules whose structures are nonsuperimposable mirror images?

structural isomers â¨

monomers â¨

polymers â¨

enantiomers â¨

Which of the following is an organism that obtains its energy from the transfer of electrons originating from chemical compounds and its carbon from an inorganic source?

a. chemoautotroph

b. chemoheterotroph

c. photoheterotroph

d. photoautotroph

7. A cell might perform anaerobic respiration for which of the following reasons?

It lacks glucose for degradation. â¨

It lacks the transition reaction to convert â¨pyruvate to acetyl-CoA. â¨

It lacks Krebs cycle enzymes for processing â¨acetyl-CoA to CO2. â¨

It lacks a cytochrome oxidase for passing â¨electrons to oxygen. â¨

8. Which of the following is not an electron carrier within an electron transport system?

a. flavoprotein

b. ATP synthase

c. ubiquinone

d. cytochrome oxidase

9. Which of the following is the purpose of fermentation?

a. to make ATP

b. to make carbon molecule intermediates for anabolism

c. to make NADH

d. to make NAD+

10. Which of the following processes produces hydrogen sulfide?

anoxygenic photosynthesis â¨

oxygenic photosynthesis â¨

anaerobic respiration â¨

chemoautrophy â¨

11. In which growth phase would you observe the most endospores in a Bacillus cell culture?

death phase â¨

lag phase â¨

log phase â¨

log, lag, and death phases would all have roughly â¨the same number of endospores. â¨

12. Which of the following is the best definition of generation time in a bacterium?

a. the length of time it takes to reach the log phase â¨

b. the length of time it takes for a population of â¨cells to double â¨

c. the time it takes to reach stationary phase â¨

the length of time of the exponential phase â¨

If a culture starts with 50 cells, how many cells will be present after five generations with no cell death?

a. 200

b. 400

c. 1600

d. 3200

14. During which phase would penicillin, an antibiotic that inhibits cell-wall synthesis, be most effective?

death phase â¨

lag phase â¨

log phase â¨

stationary phase â¨

15. Pseudomonas aeruginosa is a common pathogen that infects the airways of patients with cystic fibrosis. It does not grow in the absence of oxygen. The bacterium is probably which of the following?

an aerotolerant anaerobe â¨

an obligate aerobe â¨

an obligate anaerobe â¨

a facultative anaerobe â¨

16. Which of the following refers to photosynthesis performed by bacteria with the use of water as the donor of electrons?

a. oxygenicâ¨

b. anoxygenic

c. heterotrophic

d. phototrophic

17. Which term best describes the relationship between pathogenic bacteria and humans?
A. amensalism

B. commensalism

C. parasitism

D. predation

18. Which describes bacteria that require low concentrations of oxygen to survive (less than that in the current atmosphere)?

A. facultative anaerobes

B. microaerophiles

C. obligate aerobes

D. obligate anaerobes

19. Cyanobacteria produce which of the following?

A. hydrogen sulfide gas
B. large quantities of ammonia

C. oxygen*
D. sulfuric acid

20.How do Archaea differ from Bacteria?

A. Archaea are found exclusively in extreme habitats.
B. Archaea have ether linkages in their cell membranes.*

C. Archaea have peptidoglycan cell walls.

D. Archaea lack a nucleus.

BIOL 2051 Chapter : Chapter 4 Notes

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