PV Gap

Jimmie Said:

Help on homework please!?

We Answered:

*1. C) They use chemical energy. Not all cells use chemical E! But, most E from light is converted to Chemical E.

2. A) ATP. ATP carries E for cells. That's why when they are broken to ADP, they release E! And in order to release the E, they must have E, so it's A.

3.D) chemical energy to produce ATP. Sunlight is converted to chemical E in thylakoids of Light dependent reactions.

4. A) energy is released from an ATP molecule for cellular processes. Whenever to take off a phosphate, it changes from ATP to ADP, which releases E!

5. C) chemosynthesis. Chemo sounds like chemical. Also, Chemosythesis is like photosynthesis but it uses chemicals instead of light.

6. D) Chloroplasts absorb sunlight and store chemical energy. Think of the chemical equation of photosynthesis and you can use to process of elimination of C) and A) because CO2 is used not produced, and O2 is a product not a reactant of photosynthesis.

7. D) an organism that makes its own source of chemical energy. Producer-produce, common sense. A producer is also called an autotroph.

8. A) the main light-absorbing molecules found in plant leaves. That's why plants get their green color.

9. B) light-dependent reactions of photosynthesis. independent means ones that YOU can change, which means you don't rely on something!

10. A) carbon dioxide. Means it does NOT need sunlight. Think of the photosythesis formula!

11.B) Energy is lost. Think about the law of thermodynamics: E cannot be gained or lost, only transferred.

12.D) hydrogen ions. Process of elimination. It can't be oxygen because it's used in the 2nd part of photosynthesis. Photosystems absorb light and produce H+ ions and Oxygen.

13.C) the electron transport chain in photosynthesis. The ETC is made from proteins! Remember that!

14. A) the light-independent reactions of photosynthesis. Think of the photosynthesis formula.
15.C) energy, ATP . The main job of the 1st part of photosynthesis is to bring it into the 2nd part!
16. C) animals. Eukaryote also include plants.
17.B) oxygen is present. Cell resp. is aerobic which means it requires O2 as a reactant. Look at the chemical equation for cellular respiration.
18. D) glucose. Gylco- means sugar ysis- means the splitting.
19. B) CO2. Look at the chemical equation for cell resp!
21. C) Carbon-based molecules from food and oxygen are used to make ATP. Again, look at the formula.
22.D) Pyruvate, NADH. Again, look at the formula. Gylcoysis means the splitting of sugar! Sugar is made from C,H, and O. The H and O are used in the Electron Transport chain, therefore, only the C's are left (Carbon) The C then break down into 2 3-Carbon-Sugars otherwise known as pyruvate! (Glucose= C6 H12 O6) That's why there's 2 3-carbon-sugars.
23. C) the Krebs cycle. AND its also glycoylsis, but Krebs cycle is known to do that and produces more NADH (high energy electron carrying molecules)
24. A) the Krebs cycle, hydrogen [correct] Well you did put correct on it!
25. B) Oxygen. Oxygen is the last acceptor molecule because it picks up -e (electrons) and H+ ions and makes H20 as waste! Look at the Cell resp. formula.

Francisco Said:

BIOLOGY QUESTIONS ..need help with a bit explanation if you can.?

We Answered:

1 = a

2= a

3 = might be A or B

4 = a (Again i am not just making this up these are what i believe to be right but it was a year since i did A-level biology)

5 = ??

6 = d

7 = d

8 = ?? possibly a

9 = C or D ??

10 = b

i think these are right but take them with a pinch of salt as it has been over a year since i did bio, i would have put some explanation but im not confident enought to go into detail

Rafael Said:

2012 - Change of energy from Expanding to combining technology ?

We Answered:

Several people have designed free energy. If they could just market their work. Government won't let them of course.

Eddie Said:

Really suck at biology, please help?

We Answered:

29. control group
30. sex-linked
31. population
32. substrate
33. glycolysis occurs in the absence of oxygen, while the electron transport chain requires oxygen
34. kinetic energy
35. 23 chromosomes
36. isotopes
37. have half the number of chromosomes as the original diploid cell
38. 3 red: 1 white
39. independent variable
40. the cell may become too large to take in enough food or to remove waste efficiently
41. both type A and type O are possible
42. cohesion
43. chromatids
44. atoms
45. cell membrane
46. replication
47. carbohydrates and lipids (technically the body can use carbohydrates, lipids AND proteins for energy, but since protein is usually only a last ditch resort for energy, I believe the answer is carbohydrates and lipids)
48. only during meiosis
49. occurs in covalent bonds
50. deoxyribonucleic acid