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lutik1710 [3]
3 years ago
6

What is the anatomy of a leaf

Biology
1 answer:
tamaranim1 [39]3 years ago
8 0

Answer:

Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. In angiosperms leaves commonly have a pair of structures known as stipules, which are located on each side of the leaf base and may resemble scales, spines, glands, or leaflike structures.

Explanation:

Hope this helps

Crown me as brainliest:)

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The interaction between DNA and histone proteins (forming nucleosomes) plays a key role in the regulation of gene expression in
ladessa [460]

Answer:

A. The chromatin near cis-regulatory sequences will be more closed and there will be less transcription.

Explanation:

In the presence of histones, the cis-regulatory sequences of DNA like promoter, enhancers etc. are not exposed. The function of the histone acetyltransferases (HATS) is to cause chromosome decondensation i.e. removal of histones from the DNA so that transcription of the DNA could occur. Histone acetyltransferases (HATS) cause acetylation of lysine amino acid of the histone proteins. Acetyl group is negatively charged so the acetylation of histone proteins leads to the removal of their positive charge which ultimately leads to the decrease in the interaction between N terminal of histones and negatively charged phosphate group of the DNA molecule. As soon as histones are removed from the DNA where cis-regulatory sequences are located, the DNA becomes accessible for transcription.

But here a drug has been added which blocks the activity of histone acetyltransferases (HATS) in cancer cells. So it is quite evident that in these cells, histones will not get removed from the cis-regulatory sequences of DNA so the DNA will be more closer or tightly packed as a result of which  less transcription will occur.

7 0
3 years ago
HELP!
Advocard [28]

Answer:

TT, TT, Tt, Tt

Explanation:

Putting it in a Punnett square:

   T     t

T  TT  Tt

T  TT  Tt

7 0
3 years ago
Dust in the atmosphere represents:
Ronch [10]
Dust in the atmosphere represents suspension. It is collaborating shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entitles. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.
4 0
3 years ago
Read 2 more answers
4. Why are coral reefs only found in tropical water? *
Advocard [28]
They require shallow waters where the sun can reach them!
7 0
3 years ago
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What is the equation for calculating the change in water potential? In other words, this equation allows you to determine which
Novay_Z [31]

Answer:

The correct answer is - Ψ = ΨS + ΨP.

Explanation:

The movement of the water in a solution where is two different concentrations present can be determined by measuring the water potential (Ψ).

Water potential (Ψ) can be determined by the equation that depends on these two factors osmotic potential represent by ΨS and pressure potential represent by ΨP.

Ψ = ΨS + ΨP.

5 0
3 years ago
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