1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
V125BC [204]
3 years ago
15

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

mine the most likely mode of transport.
Biology
1 answer:
Viefleur [7K]3 years ago
6 0

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

-------------------------------------------------

There are three main different types of transport across the membrane

  • Simple diffusion ⇒ <em>Does not need energy to occur</em>
  • Facilitated transport ⇒ <em>Does not need energy to occur</em>
  • Active transport ⇒ <em>Needs </em><em>energy </em><em>to occur</em>

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

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 <u>120 mM </u><u>intracellular concentration</u><u> </u>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

<em><u>External concentration of substance(mM)      Rate of entry of substance L </u></em>

                     10                                                                     5%

                     20                                                                    25%

                     30                                                                    45%

                     40                                                                    65%

                     50                                                                     80%

                     60                                                                     90%

                     70                                                                      95%

                      80                                                                    100%

                      90                                                                    100%

                      100                                                                   100%

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

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 <u>not passive transport </u>because the molecule transport is going against its concentration gradient.

Hence, the remaining option is <u>active transport.</u> 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.

-------------------------------------------------------------

Related link: brainly.com/question/19098496?referrer=searchResults

You might be interested in
A 154-lb adult man performs a moderate level of physical activity and regularly consumes 2700 Calories a day. State whether the
Arte-miy333 [17]

Answer:

The correct answer would be - remain the same.

Explanation:

In the given table showing the average daily calories requirement according to the weight of the adult men. Which is as follows:

weight                daily intake

132                        2250

154                        2450

176                        2650

198                        2850

220                       3050

242                       3250

In this, the highlight weight and required calories should be taken by the man who does not perform any physical exercise but according to the question a man with 154 lb perform a moderate exercise, and according to the CDC a 154 lb men can burn anywhere between 140 and 295 calories in 30 minutes by moderate exercise for an hour.

Thus, the total calories he takes: 2700

burn by exercise: 295

should take: 2450

then = 2700 - (2450+295)

= 50 calories over the limit that will have negligible effect on the weight.

6 0
3 years ago
Match the vocabulary terms to their definition
stira [4]

Answer:

Explanation:hmm think about your vocab

6 0
3 years ago
Radon is an indoor air pollutant that has been linked to ________.
Rashid [163]
It has been linked to lung cancer.
hope this helps!
4 0
3 years ago
For humans, linoleic acid is one of the essential fatty acids we must consume. It is plentiful in vegetable oils, and we use it
Rus_ich [418]

Answer:

18 ATP.

Explanation:

Total 18 ATP are produced because 9 FADH2 are converted into 9 ATP molecules and the earlier 9 ATP molecules are already present in the first b-oxidation process. The first Krebs cycle produces 27 NADH, 9 FADH2 and 9 ATP while on the other hand, the second Krebs cycle produces 9 ATP molecules from  9 FADH2 so total it produces 18 ATP molecules.

7 0
2 years ago
Which of the following are adaptations of plants for photosynthesis?
vodka [1.7K]

Answer:

I think it's (E) but I'm not sure

7 0
3 years ago
Other questions:
  • Which of the following do scientists do after they have finished drawing conclusions about their research project or experiment?
    10·2 answers
  • Please help<br>this is urgent​
    12·1 answer
  • Which describes something in nature and predicts how it will behave without explaining why?
    9·2 answers
  • You might expect al but one of these thing to happen among the finch population
    13·1 answer
  • Arrange the steps in the correct order to explain how a muscle fiber contracts. Myosin and actin protein filaments attach to eac
    9·1 answer
  • Starting in 1850 when Europe become industrialized, the frequency of melanic forms of the peppered moth in populations ______ un
    10·1 answer
  • How many types of cell​ ?
    13·1 answer
  • EXPLAIN QUESTION
    13·1 answer
  • I really need help can some give me the answer. I will be very thankful &lt;3
    14·1 answer
  • Please help me fast smart people
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!