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Hunter-Best [27]
3 years ago
11

Bacteria have a nucleus but no nuclear membrane * True False

Chemistry
1 answer:
serious [3.7K]3 years ago
7 0

Answer:

T

Explanation:

Bacteria are prokaryotic cells. They do not have a nuclear membrane and chloroplast is also absent. In photosynthetic bacteria, there are lamellae called thylakoids which contain enzymes and bacterial chlorophyll necessary for photosynthesis.

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Investigators studying a particular cell response are curious about what type of cell-surface receptor might trigger it. They in
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Answer:

An ion channel, more specifically a calcium channel.

Explanation:

The electrical activity of the cells is regulated by ion channels. Calcium channels, also referred as the voltage-gated calcium channels constitute one group of a superfamily of ion channels. A change in voltage across the membrane or small molecules triggers calcium channels to open, allowing calcium to flow into the cell. Inside the cell, calcium acts as a second messenger, it binds to calcium sensitive proteins to induce different responses and support several functions such as muscle contraction, hormone and neurotransmitter secretion, gene regulation, activation of other ion channels, control of action potentials, cell survival, etc.

3 0
3 years ago
A substance that reduces the hydrogen ion concentration of a solution is __________.
ioda

A substance that reduces the hydrogen ion concentration of a solution is  <u>base</u>.

A base which thus completely dissociates in an aqueous solution is referred to as a strong base. These substances produce one or more hydroxide ions (OH-) per base molecule when they ionize in water. A weak base, on the other hand, only partially splits into its water-soluble ions.

The three definitions of "base" used in chemistry are Arrhenius base, Bronsted base, as well as Lewis base. The fact instead that bases react towards acids is acknowledged by all base definitions.

Therefore, a substance that reduces the hydrogen ion concentration of a solution is <u>base</u>.

To know more about hydrogen ion

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What is the main function of the part labeled Y in the model?
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Answer

D

Explanation

<em>the</em><em> </em><em>answer</em><em> </em><em>is</em><em> </em><em>D</em>

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