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posledela
3 years ago
12

Which is made from the remains of dead plants over millions of years? A. uranium B. natural gas C. oil D. coal

Biology
1 answer:
lora16 [44]3 years ago
5 0
The answer is coal we just studied it
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In humans, the hormone testosterone enters cells and binds to specific proteins, which in turn bind to specific sites on the cel
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Answer:

As a transcription factor

Explanation:

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The hormone shows the paracrine effect and thus act on the target cell at distant. The mechanism of action of the testosterone is that it controls the gene expression of various other genes.

The testosterone binds the specific proteins which activate the expression of the gene that is they acts as a transcription factor which activates the expression.  

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3 years ago
Which of the following best describes an aspect of a membrane's molecular structure that causes it to be selectively permeable?
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Answer:

<u>d. Transport proteins within the membrane serve as a tunnel for molecules to enter the cell. </u>

<u />

Explanation:

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While lipid-soluble molecules move across the layer easily, it is also difficult for charged and also large molecules to move across its surface, into the cell. Transmembrane channels, <u>embedded within the membrane</u>, help to maintain selective permeability as transport proteins, pores and gated channels. Simple diffusion happens as a method of passive transport in cells through plasma membranes.

The solutes travel through the plasma membrane in the process of diffusion from regions of high concentration to regions of low concentration; this occurs without the use of energy. <u>Molecules moving against their concentration require active transport mechanism to cross the membrane</u>.

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Answer:

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Explanation:

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True.  Many innovators and inventors have used new scientific methods to develop and improve communication and transportation devices in many ways.  They were able to either make them faster or more fuel efficient.  They have also given rise to new ways to communicate such as the internet and have developed devices that make it easier for people to come together.

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3 years ago
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Things of the same species have similar morphology and can ____
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Things of the same species have similar morphology and can INTERBREED
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