Is quartz a homogeneous or heterogeneous substance?

1 answer:

3 0

Quartz (also known as silica) is a crystalline pure substance composed of silicon dioxide (SiO2). It is ,therefore, homogeneous.

It is good to know that inhaling finely divided crystalline silica can be poisonous and can lead to several diseases including lung cancer, bronchitis as well as silicosis.

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What clues could you use to help determine whether movement of oslutes through the apicl and basolateral cell membranes is passi

Setler79 [48]

Answer:

Clues that can be used to determine whether the movement of solutes through the membrane is passive or active could be the molecule size, membrane potential, and the presence/absence of membrane protein.

Explanation:

Solutes transport through the cellular membrane depends on the solute size, membrane potential, and the presence/absence of integral membrane protein.

There are two types of transport: Active and passive.

- Passive transport: It does not need energy; it is driven by a chemical potential gradient. Small molecules with no charge are transported through the membrane in a gradient favor, from a high concentration region to a low concentration region. There are two types of passive transport: By simple diffusion (small molecules pass through the membrane by themselves) and by facilitated diffusion (molecules are helped by integral membrane proteins to pass through the membrane). In facilitated diffusion, the helping protein can be a channel protein (hydrophilic pores that allow the molecule to pass with no interaction) or a carrier protein (proteins with mobile parts that suffer modification as the molecule pass to the other side).

- Active transport: It does need ATP energy to pass the molecule through the membrane, as they have to move against the electrochemical gradient. This kind of transport is always mediated by a carrier protein. These proteins join with the molecules and suffer changes as they pass the solute to the other side of the membrane. An important example of this kind of transport is the sodium-potassium bomb.

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3 years ago

Three boats were moving across the surface of a smooth lake. The gray and pink boats have the same mass, and both of these boats

garik1379 [7]

Answer: There is no diagram but I had this on a test last week. The answer is the gray and pink boats experienced the strongest force because they are both more massive than the orange boat, and they all changed speed by the same amount.

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2 years ago

Is an experiment in which participants do not know if they are in the experimental or the control group, but the experimenters d

Oksanka [162]

It is called blind. a condition in which the participant is not aware if he/she is in the experimental or control group

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3 years ago

How many genes are shared by all viruses?

Dominik [7]

Answer:

200 approximate

Explanation:

depends how many in common

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2 years ago

Which of the following is not true about cells?

ale4655 [162]

I believe it is D, the reason being is because they form on their own, not from a living or dead organism. It can't be B because that is true, and the same for C. hope this helps, have an amazing day :)

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3 years ago