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Inessa [10]
3 years ago
10

3. The time it takes for the number of leaves to increase from 15 to 30 is approximately ___ days (1) 2.0 days (2) 2.3 days (3)

2.9 days (4) 3.2​
Biology
1 answer:
Alenkinab [10]3 years ago
5 0

Answer:

(2) - 2.3 days.

Explanation:

found it on a PDF lol

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What are two advantages and disadvantages of sexual reproduction?
EastWind [94]

Advantages:

- It brings a unique species

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Disadvantages:

-It takes two people

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Hope this helps :)

3 0
3 years ago
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
In contrast to eukaryotic cells, prokaryotic cells
Hunter-Best [27]
Does not have a nucleus. The prokaryotic cell's chromosome float around the cell itself.

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3 years ago
The drug colchicine inhibits the formation of spindle fibers during mitosis. If you treat dividing plant cells with colchicine,
vekshin1

Answer:

D

Explanation:

During metaphase of cell division, the chromosomes line up in the metaphase plate and the spindle fibers from the poles extend and attach to the centromeres of the chromosomes. The spindle then contracts and pull different chromosomes to the opposite poles of the cell before the parent cell divides.   If spindle fibers do not form, then the chromosomes will not separate during anaphase.

Therefore, the final cell after mitosis will be a cell with double the number of chromosomes -because if you remember, during interphase, genetic material is replicated so each daughter cell can have its copy-. Due to quality control in the process of cell divisison, this cell will mostly undergo apoptosis, otherwise, it could develop into cancer.

8 0
3 years ago
A doctor is examining a gland under a microscope. It has a duct. What type of gland is it?
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3 years ago
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