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zhannawk [14.2K]
3 years ago
14

The most difficult part of an experiment is formulating a problem that tests only one factor.

Biology
1 answer:
Simora [160]3 years ago
7 0
I believe the answer is false. 
But I also feel like this is more of an opinion based question.
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What machines and tools are being used for farming nowadays?​
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Explanation:

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2 years ago
Which of the following best describes an aspect of a membrane's molecular structure that causes it to be selectively permeable?
atroni [7]

Answer:

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

<u />

Explanation:

Solutes are typically moved across the cell through either passive or active transport. The cells, surrounded by a bilipid layer or plasma membrane is amphiphlic- its polar, hydrophilic lipid heads face outwards, while their non-polar hydrophobic lipid tails face inwards towards each other.

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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2 years ago
"Yeah, I know who you're talking about. I can picture the face - big guy, about 250 pounds. His name starts with a P. This is dr
sukhopar [10]

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tip-of-the-tongue effect

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2 years ago
PLEASE HELP!!!<br>How do the Aleutian volcanoes differ from the Cascades volcanoes?
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Type of Convergence - Ocean to continent for Cascade/ Ocean to Ocean for Aleutian

Explanation:

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Mitochondria contain their own genome, are able to duplicate, and actually divide on a different time line from the rest of the
Alborosie
The mitochondria is irrelevant
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