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posledela
3 years ago
8

List 3 ways molecules cross a cell membrane without using energy

Biology
1 answer:
harkovskaia [24]3 years ago
5 0
1. Diffusion
2. Osmosis
3. Facilitated Diffusion
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What causes large amounts of air to move?
timofeeve [1]

Answer:

There is a term "atmospheric circulation". It is when the air throughout the globe moves around. When the sun heats air near the equator more, and less at the poles. So the equator is warmer. The warm air near the equator moves either towards the south or the north, toward the poles. The warm air also rises up, and the cold air sinks. This is convection, but at a global scale. THis is also the cause of wind.

3 0
2 years ago
Which is the pair of the enzyme activities most significantly affected by glucagon- and insulin-dependent phosphorylation and de
prisoha [69]

Answer:

b. Phosphofructokinase;  Fructose-1,6-bisphosphatase

Explanation:

Glucagon is a hormone which functions to initiate gluconeogenesis whwreas insulin functions to initiate glycolysis.

Fructose-2,6-bisphosphate (F26BP) is an allosteric regulator of the <em>glycolytic and gluconeogenic enzymes phosphofructokinase-1 (PFK-1) and fructose-1,6-bisphosphatase (FBPase-1).</em>

It stimulates glycolysis and inhibits gluconeogenesis by binding to its allosteric site on phosphofructokinase-1 reducing its affinity for the allosteric inhibitors ATP and citrate .

It is formed by phosphorylation of fructose-6-phosphate catalyzed by  <em>phosphofructokinase-2</em> and is broken down by <em>fructose-2,6-bisphosphatase </em>which are two separate enzymatic activities of a single, bifunctional protein (PFK-2/FBPase-2).

Phosphorylation of PFK-2/FBPase-2 due to glucagon release enhances its FBPase-2 activity thereby stimulating gluconeogenesis and inhibiting glycolysis.

Dephosphsorylation of PFK-2/FBPase-2 due to insulin release enhances its PFK-2 activity, thereby stimulating glycolysis and inhibiting gluconeogenesis.

3 0
4 years ago
Why are horses and donkeys considered the same species even though they can produce offspring
alisha [4.7K]

Donkeys and horses can have a mule together, but the mule is unable to have offspring of its own. That is why horses and donkeys are considered to be different species - their offspring is infertile

3 0
3 years ago
Which structure would be unaffected by the peripheral nervous system?
Sphinxa [80]
For the answer to the question above, the peripheral nervous system governs <span>all structures outside the brain and spinal cord. Peripheral nerves branch from the spinal cord through the foramen transversarium of each vertebrae. I suppose the structure it would not affect is the brain itself since cranial nerves are responsible for brain activity. Also, the spinal cord would also be unaffected since it is just a cylindrical bundle of nerve fibers that allow the connection of the peripheral nerves to the brain.</span>
6 0
3 years ago
Which organ is responsible for dehydration and compaction of indigestible materials?
Deffense [45]

The answer for that is B large intestine

3 0
4 years ago
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