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3 years ago

DNA and RNA are composed of units that are made up of

Biology

1 answer:

STatiana [176]3 years ago

4 0

DNA and RNA, are made from monomers known as nucleotides.

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_____ splits water into 1/2 O2, H , and e- . A structure of a thylakoid. Letters from A to E indicate definite structures. Lette

Sauron [17]

The luminous reactions begin when light reaches photosystem II. The water molecules provide electrons to the photosystem, releasing oxygen and protons. The letter A represents photosystem II that splits water.

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1. Luminous energy is trapped by chlorophyll in Photosystem II.

2. When the pigment molecules absorb light, electrons provided by water molecules get in a higher energy level.

3. The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4. When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5. Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6. When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7. When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8. The released energy is used to produce ATP molecules.

9. Hydrogen ions go back from the stroma to the thylakoid compartment.

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6 0

3 years ago

___ controls usually involve only one organ or tissue.

IRISSAK [1]

Answer:

B. Intrinsic

Explanation:

Intrinsic controls are also known as local controls involve only one organ or only one tissue. Intrinsic controls allow the organ or the tissue to maintain homeostasis on their own. For example, the heart it controls its heartbeat. As a response to changing blood volume, the heart adapts to it by controlling its heartbeat.

5 0

3 years ago

In terms of homeostasis, why is it important for some reactions to be reversible?

ArbitrLikvidat [17]

Answer:

Because sometimes, certain chemical reactions can excite/slow down an organism, and the action needs to be reversed to maintain normality.

5 0

3 years ago

HELP PLEASE

Alex

Answer:

I can’t answer all of them, but I’ll answer the oxygen ones.

The mitochondria uses oxygen. In mitochondria, this process uses oxygen as a waste product. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell.

I hope this helps, even though I only answered 3 of your questions!!

3 0

3 years ago

With help from other enzymes, DNA polymerase acts to join nucleotides together to form a new strand of DNA. During normal DNA re

Licemer1 [7]

Answer:

I think the answer is B

7 0

4 years ago

Read 2 more answers