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lutik1710 [3]
2 years ago
11

Working out the order in which the individual components in a signaling pathway act is an essential step in defining the pathway

. Imagine that two protein kinases, PK-B and PK-X, act sequentially in an intracellular signaling pathway: - When either kinase is completely inactivated, cells do not respond to the normal extracellular signal. - Cells containing a mutant form of PK-B that is permanently active respond even in the absence of an extracellular signal. - Doubly mutant cells that contain inactivated PK-X and permanently active PK-B respond in the absence of a signal. A. In the normal signaling pathway, does PK-B activate PK-X or does PK-X activate PK-B? Explain your reasoning.
Biology
1 answer:
Naily [24]2 years ago
8 0

Answer:

In the usual signalling pathway, PK2 triggers and initiates PK1. We can deduce this from the fact that if PKI is fully initiated, a response is seen and the response is seen as not dependent on the status of PK2, which pinpoints to the fact that PK2 is promoted ensuing of PK1. Let's infer that if the experimental setup happened to be altered in such a way as it causes PKI to be mutationally non-functional and PK2 possessed a stimulating mutation, no response can be said to be seen due to the fact that PK2 won't initiate PK1.

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Jet lag occurs when a person moves rapidly from one time zone to another, causing conflict between the body's biological rhythm
vova2212 [387]

Answer:

c) melatonin

Explanation:

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Jetlag is a sleep disorder common to those who travel swiftly over several time zones. It is not a permanent sleep disorder. Its due to the body's internal clock lacking sync with cues generated in a different time zone, Cues may be due to light exposure and how often the person eats.

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Specific cells of the tissue at retina moves the light signals the thypothalamus.

At night, the hypothalamus signal to the pineal gland to produce melatonin. At daylight hours, the reverse is the case.

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2 years ago
When the _______5___ reaches the end of an axon, the neurotransmitter is released, and it diffuses to the muscle cell membrane t
postnew [5]

Answer:

5- action potential 6- receptors 7- calcium ions 8- sarcolemma

Explanation:

This description illustrates the pathway of a action potential traveling along a neuro-muscular junction. this functions as a chemical synapse between a motor neuron and a muscle fibre. It allow the motor neuron to transmit a signal/action potential to the muscle fiber, causing muscle contraction.

4 0
2 years ago
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Scilla [17]

Answer:

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As the birds eat the rice, they trample the grounds making trilling unnecessary hence benefiting the rice farmers.

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Primary spermatocytes are diploid (2n) cells with all of the organelles typically found in eukaryotic animal cells. Spermatogene
Aneli [31]

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b. Can also be explained in terms of crossing over

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Unlike lipids, nucleic Acids typically do not...
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