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2 years ago

Processes that increase the density of seawater include evaporation and _____.

Biology

2 answers:

mihalych1998 [28]2 years ago

8 0

The formation of sea ice.

Nadya [2.5K]2 years ago

7 0

Question: Processes that increase the density of seawater include evaporation and

Answer: formation of sea ice

Explanation: Sea ice formation lowers the seawaters temperature while evaporation increases the salinity.

question answered by

(jacemorris04)

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(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps deter

Viefleur [7K]

Active transport occurs against the electrochemical gradient. It needs energy to move molecules from the lower concentration side to the higher concentration side. The mode of transport is active transport. 

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There are three main different types of transport across the membrane

Simple diffusion ⇒ Does not need energy to occur
Facilitated transport ⇒ Does not need energy to occur
Active transport ⇒ Needs energy to occur

Active transport is the transport of molecules that move against the electrochemical gradient, so it does need energy to happen.

Molecules move from the lower concentration side to the higher concentration side of the membrane.

Carrier proteins are in charge of active transport. The needed energy might proceed from the ATP molecules or the membrane's electric potential.

In the exposed example, a scientist wants to determine how substance L enters a cells in a culture.

The cells maintain a 120 mM intracellular concentration of substance L.

Varying external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).

Table 1. Rate of entry of substance L into mammalian cells in culture

External concentration of substance(mM) Rate of entry of substance L

10 5%

20 25%

30 45%

40 65%

50 80%

60 90%

70 95%

80 100%

90 100%

100 100%

Now, we need to identify the most likely mode of transport across the membrane for substance L, and explain how information provided helps determine the most likely mode of transport.

We know that the intracellular concentration is 120mM.

As we can see, this concentration exceeds all of the culture media concentrations. Yet, the substance keep moving into the cell.

As the concentration inside the cell is always higher than the concentration outside, we can assume that this is not passive transport because the molecule transport is going against its concentration gradient.

Hence, the remaining option is active transport. And as said before, we can see it because the substance keeps crossing the membrane toward the cell interior despite its concentration being higher in the interior of the cell than in the exterior.

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2 years ago

If nondisjunction occurs and an individual survives, which disorder can occur?

Semenov [28]

The answer is Klinefelter syndrome.
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The image below represents which factor that can lead to evolution at the population level?

Radda [10]

I'm assuming this is the same image that was posted before, therefore the answer is "gene flow" which occurs through population groups by natural selection and other factors.

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PLEASE HELP Scientists in a lab were running tests on a new enzyme found inside of squid ink. While experimenting how the enzyme

lord [1]

What grade are you in ?

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Answer:

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