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IceJOKER [234]
3 years ago
11

Which of the following explains why meiosis contributes to genetic variations?

Biology
1 answer:
3241004551 [841]3 years ago
7 0

Answer:

A

Explanation:

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Plz help ............. I have a test on this tomorrow
salantis [7]
2.Uniformitarianism is events and catastrophism is changes. 3.relative dating is the age of rocks and geologic features compared with other rocks and features nearby and absolute age is to mean the numerical age. 4. The decay is the process by which an unstable element naturally changes into another element that is stable and dating is one important radioactive isotope used for dating. 5. Superposition is rock layers at the bottom and crosscutting relationship is a rock layer going though another rock layer
8 0
3 years ago
(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. <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

6 0
3 years ago
"after 12 hours without eating, seth is very hungry. it is likely that seth's blood glucose level is _______________ and his blo
viva [34]
After 12 hours without eating, Seth is very hungry. It is likely that Seth's blood glucose level is LOW and his blood insulin level is HIGH.
A situation in which the blood glucose level is low is called hypoglycemia. In this situation, the level of glucose in the blood is much more lower than the normal level. This may be caused by a lot of factors. When the blood glucose level is low, the glucagon hormone mobilize the liver to release glycogen which is converted to glucose. The presence of glucose in the blood increase the level of insulin secretion which in turn increased the feeling of hunger in the individual. 
8 0
3 years ago
Please help i’ll give brainliest
vaieri [72.5K]

Answer:

Producers................

5 0
3 years ago
Differentiate between Angiosperms and gymnosperm​
DedPeter [7]

Answer:

Angiosperms are vascular plants bearing the seeds in fruits or mature ovaries whilst gymnosperms are other types of the plant which bears the seeds directly on the sporophylls but without any cover.

Explanation:

Examples of gymnosperms include cypress,pine, redwood, spruce and ginkgo.

Examples of angiosperms include apple, banana,peach, cherry and orange.

Also, angiosperms are seeds producing flowering plants whose seeds are enclosed within an ovary.

Gymnosperms are also seeds producing non flowering plants whose seeds are unenclosed.

Hope it helps.

Please mark as brainliest .

4 0
2 years ago
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