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Sedbober [7]
3 years ago
9

Please help me with this

Biology
1 answer:
vova2212 [387]3 years ago
7 0

Answer:

3.The plants get their energy from the sun.

4.Most of the arrows are facing the eagle.

5.The rabbits and snakes would overpopulate.

Explanation:

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Describe the experiment, to show that light intensity, water, chlorophyll, and cabondioxide are needed for photosynthesis
lisov135 [29]

Answer:

Is light needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2.  a. cut the leaf in 2

b. 1 part in an opaque box and 1 part in a transparent box (one with light and one without)

     3. Test for starch (BEWI)

B. Is carbon dioxide needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2.  a. cut the leaf in 2

b. 1 part in a box with CO2 absorber and 1 part in box with a CO2 provider

     3. Test for starch (BEWI)

C. Is chlorophyll needed for photosynthesis?

1. Destarch the plant (remove previously made starch from plant)

2. Use a variegated leaf

     3. Test for starch (BEWI)

B E W I

1. Put leaf in boiling water to destroy the cell membrane and denature enzymes

2. Ethanol in a hot water bath to remove chlorophyll

3. Warm water to soften the leaf

4. Add drops of iodine solution

Explanation:

3 0
2 years ago
What is the determining factor for the transcription of structural genes of the trp operon?
padilas [110]

The right answer is 3. the availability of tryptophan in the environment

The TRP operon regulation depends on the availability of the tryptophan molecule (it depends if the cell need tryptophan or already has it).

There are two modes of regulation of the trp operon: Suppression and Mitigation

*Repression

The synthesis of operon mRNA is controlled by a repressor that blocks transcription when bound by tryptophan, which acts as a co-repressor.

The repressor, a 108 aa homodimer (ie 2 apo-repressor), has helix-turn-helix domains that interact with inverted repeats at the major groove of the operator, thus allowing its fixation.

In the absence of trp, the repressor is inactive and does not attach to the operator. The RNA polymerase can bind to the promoter and transcribe the trp E, D, C, B, A structural genes.

In the presence of trp, the repressor changes conformation and becomes active, so it binds to the operator, preventing RNA polymerase from accessing the promoter so transcription will not occur.

* The Attenuation

This is a premature termination of transcription that is a function of Trp concentration. It takes place at a late moment of transcription while regulation by repression is done during the initiation.

1st Case: Low Trp Rate, Continuous Transcription, → Formation of the Anti-attenuator in the absence of trp, and therefore the synthesis of tryptophan is continued.

2nd case: High rate of trp, stop transcription, → Formation of the attenuator in the presence of trp. This one will attenuate the synthesis of tryptophan.

4 0
2 years ago
Which will increase the rate of a chemical reaction?
beks73 [17]

Answer:

adding a catalyst

Explanation:

catalysts accelerate the speed of chemical reactions

4 0
3 years ago
Read 2 more answers
The Earth is about _______ years old, and life has existed on Earth for about _______ years.
Naya [18.7K]

Answer:

is about 4.6 billion years old

8 0
3 years ago
How are global wind speeds a natural resource
n200080 [17]
Because they can make energy, is free to anybody, and can be found everywhere that you go.
5 0
2 years ago
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