Answer: A.)
Explanation:
You know that PH stands for potential of hydrogen. U know that hydrogen is not acidic, so C is out of the way. So the correct answer is A.) It is basic.
Answer:
<em>The correct option is A) mesosphere only</em>
Explanation:
The solar radiation is not absorbed by the mesosphere of the Earth. Hence, the temperature of the mesosphere decreases as the altitude increases. At the mesopause, the temperature begins to increase with altitude, and this trend continues in the thermosphere.
On the other hand, in the stratosphere, temperature increases with altitude. Hence, other options are not correct.
Answer: Countertransport
Explanation:
Cotransport is a type of active transport of substances through a biological membrane. It is characterized by the simultaneous transport of two or more substances, hence its name, and is common in small organic molecules, such as glucose or amino acids, especially in epithelia of absorption and secretion, such as the small intestine and renal tubules. The cotransport can be of two types, simporte or antiport.
- Simporte: <u>the two transported molecules move in the same direction</u>, for example both are transported into the cell.
- Antiport: <u>the two molecules move in the opposite direction</u>, one towards the outside of the cell and the other towards the inside.
In both cases, one of the substances moves in favor of its gradient and the other against it. In electrochemical gradients there is potential energy stored and when a substance moves in favor of its gradient this energy is released.
In contransport, the transmembrane protein responsible for co-transportation, is able to use the energy stored in the electrochemical gradient of a substance to move the other substance against its gradient. The electrochemical gradient from which the energy for transport comes is maintained by ATPases, which consume ATP. Since the co-transporter does not directly consume ATP, the co-transport is classified as secondary active transport, while the ATPases perform primary active transport. So, ATPases consume energy to create a gradient and then co-carriers use the energy from the gradient to transport another substance.
In the case of Countertransport, the cell transports two types of molecules in the opposite direction across the membrane. Countertransport is a type of antiport exchange. The key point regarding countertransport is that it transports ions or molecules in opposite directions. Thus, one molecule leaves the cell while the other enters at the same time through the membrane. In addition, this is a type of secondary active transport that uses electrochemical gradient to drive the movements (as it was explained before). Countertransport can mediate the exchange of the same solutes or different solutes. The sodium-calcium exchanger, the Na+ / H+ exchanger and the Cl- / bicarbonate exchanger are examples of countertransport.
The light reactions of photosynthesis supply the Calvin cycle with (d) ATP and NADPH.
Light reactions are photochemical reactions which are directly driven by light. They are responsible for the synthesis of ATP as well as NADPH.
Light reactions take place in the membranous system that is present within the chloroplasts. The membrane system consists of grana, the stromal lamellae and the matrix stroma.
The products of light reaction include ATP, NADPH as well as O₂. However, ATP as well as NADPH are used in driving the processes which result in the production of sugars, whereas O₂ diffuses out of the chloroplast.
To learn more about light reactions here
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