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Irina-Kira [14]
3 years ago
6

Which of the following are thought to be most closely related to humans?

Biology
1 answer:
Oxana [17]3 years ago
4 0

The correct answer is: sea stars

All animals listed above are invertebrates. One of the characteristic of invertebrates are that they are protostomes with the exception of Echinodermata (sea stars). The difference between protostomes and deuterostomes is in their embryonic development (orgin of mouth and anus).

In protostomes the mouth forms first: the oral end of the animal develops from the first developmental opening. On the other hand in deuterostomes the first opening (the blastopore) becomes the anus, and the oral end of the develops from the second opening.

Humans are also deuterostomes.  

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What are the common promoter elements found in eukaryotic genes, and how are they different from enhancer elements?
V125BC [204]

Answer:

In eukaryotic cells you find core and proximal promoters.

Promotors are specific DNA sequences where transcription factors (proteins) and RNA polymerase binds to initiate transcription. Promotors are located upstream the coding sequence

Core promoters are where RNA polymersae binds and proximal promoters are where transcription factors bind.

Enhancer elements are DNA sequences where transcription factors (proteins) bind to increase the rate of expresion of an specific gene. Enhancers can be located either upstream,  downstream or thousands of nucleotids away  from the of the coding region.

Explanation:

Promoters and enhancer are key elements for controling gene regulation. Transcription begins when chromatin rearranges from a condensed state to a accesible state, this allow to transcrition factors and RNA polymerase to  bind specif DNA sequences (promotors).  Proteins bind to enhancers , this complex develops a DNA loop, so that the protein that is bound to the enhancer interacts with the RNA polymersase. When this interaction is made, the activity of the RNA polymerase is increased.

7 0
3 years ago
Membrane-bound proteins that allow identification of a cell as self or nonself are called
zloy xaker [14]
I think the answer is recognition proteins!
7 0
3 years ago
Which piece of evidence supports the theory of continental drift? A. similar animal fossils found in South America and Africa B.
bearhunter [10]
A:similar animal fossils found in South America and Africa
7 0
3 years ago
Name the 4 main atmospheric factors that influence weather?
romanna [79]
Solar Distance:
The solar distance is the distance<span> between the Earth and the Sun. Since the Earth rotates, the distance changes. 
</span>
Air Pressure:
The air pressure/atmospheric pressure is <span>the pressure spent by the weight of the atmosphere. 

</span>Latitudinal Location:
the latitudinal location is used, with longitude, to specify the exact location<span> of features on the Earth surface. 
</span>
Water presence:
The water presence is the existence of water. 

There are many factors that influence the weather but the 4 main ones are solar distance, air pressure, latitudinal location, and water presence. 

I hope this helps!
7 0
3 years ago
In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gen
azamat

Answer:

In multicellular organisms, the mechanism most directly responsible for directing development and maintaining homeostasis is gene "regulation"

Explanation:

Even though the organs present throughout the body helps in maintaining the homeostasis, But the systems like endocrine system and nervous system plays important role in sustaining and regulating it.  The gene regulation is the increase and decrease of the specific gene products. Gene regulation can also be understood as the regulating process which helps in controlling ability of the cell to the environmental changes or can say the adaptability of the cell to changing environment done by gene regulation.

8 0
3 years ago
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