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dlinn [17]
3 years ago
5

Why are lipids and proteins free to move laterally in membranes?

Biology
1 answer:
Sonja [21]3 years ago
5 0
According to fluid mosaic model proteins are embedded in sea of lipids like icebergs are floating in the sea. These molecules are not tightly bound so that lateral displacement is possible.

There are only weak hydrophobic interactions in the interior of the membrane.
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Put the following statements about a synapse in the correct order.
Fiesta28 [93]

Answer:

Action Potential reaches the Axonal terminal

Vesicles filled with neurotransmitters move to the end of the axonal terminal

Neurotransmitters are released into the synaptic cleft

Neurotransmitters attach to the sodium channels on the dendrite.

Sodium channels open

Sodium moves into the Dendrite

Action potential travels through the dendrite

Explanation:

The process of transmission of action potential across a synapse ( a junction between two neurons) begins with the arrival of an action potential from the presynaptic neuron. The steps are given below:

Action Potential reaches the axonal terminal of the presynaptic neuron

Vesicles filled with neurotransmitters move to the end of the axonal terminal of the presynaptic neuron

Neurotransmitters are released into the synaptic cleft

Neurotransmitters attach to the sodium channels on the dendrite of the postsynaptic neuron

Sodium channels open

Sodium moves into the dendrite of the postsynaptic neuron.

Action potential travels through the dendrite towards an effector or another neuron.

8 0
3 years ago
Why does NADH and FADH2 donate their H+ to the electron transport chain readily?
galina1969 [7]

Answer:

b. Because they have a low affinity for the H+

Explanation:

All electrons that enter the transport chain come from NADH and FADH2 molecules that are produced in earlier phases of cellular respiration: glycolysis, pyruvate oxidation and the citric acid cycle.

NADH is very good at donating electrons in redox reactions (that is, its electrons are at a high energy level), so you can transfer your electrons directly to complex I and transform it back into NAD +. The movement of electrons through complex I in a series of redox reactions releases energy, which the complex uses to pump protons from the matrix into the intermembrane space.

FADH2 is not as good for donating electrons as NADH (that is, its electrons are at a lower energy level), so it cannot transfer its electrons to complex I. Instead, it introduces electrons to the transport chain through complex II, which does not pump protons through the membrane.

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Why would chemical weathering affect the kinds of minerals in soil as the soil is formed??
Vilka [71]
Process by which the internal structure of a mineral is altered by the addition or removal of elements. Change in phase (mineral type) and composition are due to the action of chemical agents. Chemical weathering is dependent on available surface for reaction temperature and presence of chemically active fluids.
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3 years ago
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