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alexandr1967 [171]
3 years ago
12

DNA compaction into chromosomes is dependent upon a family of proteins called histones. These essential DNA organization protein

s serve to package and organize DNA while ensuring that sections of DNA needed for transcription are readily available to the appropriate cellular machinery. Classify the statements as describing all histones classes, histone H1, histones H2A and H2B or histones H3 and H4.
Biology
1 answer:
irinina [24]3 years ago
8 0

Answer:

Explanation:

The history protein H2A, H2B, H3 and H4 forms an octamer ( 2 each of the four histones) around which the DNA is wrapped. They help in packaging the DNA allowing for compaction of the DNA

Linker histone H1 and a length of DNA (linker DNA) links two nucleosomes together and they also play essential role in chromatin strucrure, stabilizing it and also modulating accessibility of the DNA to biological processes.

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18.
bagirrra123 [75]

The correct answer is rapids and waterfalls.  

Rapids refers to the segments of streams with extensively vigorous currents, various obstacles, and steps in their streambeds. A waterfall refers to a vertical drop in a stream bed. Both are the locations of vigorous erosion.  

The rapids are generally produced where the resilient bedrock limits a stream to a narrow channel and forces an enhancement in the velocity of water.  

On the other hand, waterfalls are produced where the fast-flowing water negotiates a geologic contact amid the more resilient and less resistant layers of rock, or through a fault, which has analogized distinct kinds of rocks. Or it can be said that waterfalls usually produce at the end of a series of rapids.  


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3 years ago
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What does the DNA serve as?
guapka [62]
Building blocks for are body
5 0
3 years ago
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Which of the following is not a means of water erosion?
Effectus [21]
There are several things that can cause water erosion. The one that is not a means of water erosion is natural springs. The correct answer is C. 
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3 years ago
Why is sex imperative to evolution?
dimaraw [331]
Sex is important because its how we reproduce we create new life so that they can create new life and so on with out sex theres no life if that makes sense 
8 0
3 years ago
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Evidence that cytoskeletal elements have ancient origins comes from the: sequence similarities of cytoskeletal elements when com
Gnesinka [82]

Answer:

All of these choices are correct.

Explanation:

A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.

A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.

Generally, cells have the ability to independently replicate themselves. In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles in all living organisms such as trees, birds, and bacteria include; nucleus, cytoplasm, cell membrane, golgi apparatus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, vesicles, cytoskeleton, etc.

Cytoskeleton refers to a structure consisting of filaments and tubules which help to maintain internal organization and support the shape of the cells. It comprises of three (3) main filaments and these includes: actin filaments, intermediate filaments and microtubules.

Generally, there are numerous evidence that cytoskeletal elements have ancient origins and they include all of the aforementioned facts.

3 0
3 years ago
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