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uranmaximum [27]
3 years ago
11

Which macromolecule makes up the main structure of the cell membrane?

Biology
1 answer:
tiny-mole [99]3 years ago
4 0

Answer:

Lipids

Explanation:

Cell membranes are composed of proteins and lipids. Since they are made up  of mostly lipids, only certain substances can move through. Phospholipids are the most abundant type of lipid found in the membrane.

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Explanation:

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3 years ago
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Two protein kinases, K1 and K2, function sequentially in an intracellular signaling pathway. If either kinase contains a mutatio
Korolek [52]

Answer:

The order must be K2→K1, since the permanently active K1 allele (K1a) is able to propagate the signal onward even when its upstream activator K2 is inactive (K2i). The reverse order would have resulted in a failure to signal (K1a→K2i), since the permanently active K1a kinase would be attempting to activate a dead K2i kinase.

Explanation:

  • You characterize a double mutant cell that contains K2 with type I mutation and K1 with type II mutation.
  • You observe that the response is seen even when no extracellular signal is provided.
  • In the normal pathway, i f K1 activat es K2, we expect t his combinat ion of two m utants to show no  response with or without ext racell ular signal. This is because no matt er how active K1 i s, it would be unable to  act ivate a mutant K2 that i s an activit y defi cient. If we reverse the order, K2 activating K1, the above  observati on is valid. Therefore, in the normal signaling pathway, K2 activates K1.
7 0
3 years ago
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