I need Multiple choice help on Biology please.?

Question

18. In bacteria-size mitochondria, both plant and animal cells produce _______, expelling _______ in that process.

A. glucose, water
B. glucose, oxygen
C. ATP, water
D. ATP, oxygen


19. If you're a fat molecule forming the inner layer of a cell membrane, your head will face toward

A. the watery environment outside the cell.
B. the watery environment inside the cell.
C. either the inside or the outside of the cell.
D. the protein pump in the cell.


20. I invented the basics of sexual reproduction, getting around from place to place, and how to use energy from the Sun. Who am I?

A. Bacterium
B. Multicellular organism
C. Chain of DNA
D. Cooperating cell community

Answer 1

18. D. Oxygen and energy (ATP) are products of aerobic respiration, whcih takes place in the mitocondria.

19. B. The cell membrane is called a LIPID BILAYER. which has 2 layers of phospholipds. the hydrphobic tails in the center. and the 2 heads facing out side the cell and inside the cell. the inner layer would have the head facing the inside of the cell.

20. A. the bactera (monerans) were one of the earliest forms of life. The had the earliest form of sexual reproduction by exchanging DNA with another bacterium through their membranes. They were also mobile (getting around from place to place). For example, some bacteria have flagela, which whip around for them to move. an getting energy from the sun... hmm. well. im not sure if bacteria can photosynthesize. but im 100% sure they can get energy from the sun INDIRECTLY through cellular respiration.

Answer 2

Wow, a lot of different answer, I'll explain why I'm right.

18. C Glucose molecules are way to large to enter mitochondria, by the time it reaches the mitochondria it is a molecule called Acetyl CoA. Mitochondria and your cells as a whole NEED oxygen to get rid of waste product. Carbon from the broken down glucose is expelled as CO2. Water is made in the mitochondria because they need to get rid of some of the hydrogen used to transport the high-energy electrons the mitochondria take energy from.

19. B - Cell membranes are made mostly from a phospholipid bilayer, phospholipids are the fats described in the question. To understand the question you have to know that 1. Phospholipids have two parts a positively charged head and a neutral tail made from two fatty acids. Because the heads are attracted to water they will always face towards it and the tails away. The fat molecule in the question is forming the inner portion of the membrane so the head must face the cytoplasm (water environment) of the cell.

20. I don't like this question, but I'm going to say A. Here is why.

Given the bacterium where the first organisms I think you can safely say they invented locomotion through flagella. Bacteria get their energy from a multitude of ways, but cynobacteria specifically get their energy from the sun, plants probably inherited this function from them. Bacteria reproduce ASEXUALLY, this may be construed as the basics of sexual reproduction.

Edit to add source since the first question seems to be in such disagreement.

Answer 3

18 - A
19 - C (hey does it matter if im fat molecule or not? LOL..the question is interesting)
20 - A (there are some bacteria who use sunlight.. humm how do we call it? photosynthetic bacteria?)

Answer 4

Read your text book before you try to take a take home test.

Answer 5

18 d
19 a
20 b

Answer 6

that's a tuff test, glad i'm out of school--no child left behind--hooooray

Answer 7

18.C
19.B
20. A

Answer 8

18-- is too vague for me right now at least
19--is C, remember, the layer looks like
0000000
((((((((((
----------
))))))))))
0000000

the lipid heads face away from each other
20--C i think---maybe

Answer 9

im GUESSING that 20 is D but dont count on it

Answer 10

lol guess and im sorry i can't help you im only in 9thgrade ihaven't learned biography yet. sorry.