D. Nuclei because according to my recent research on this problem.
Answer: The correct answer is A. Molecules are moving against a concentration gradient.
Active transport is a process in which molecules move from a medium of low concentration gradient to a medium of high concentration gradient across the cell membrane. Since molecules move against the concentration gradient, therefore, this process requires energy.
Active transport is primarily divided into two types-
Primary active and secondary active transport.
In primary active transport, metabolic energy is used directly ( Example- hydrolysis of ATP)
In secondary active transport, energy is utilized by the movement of one molecule along the concentration gradient. This movement is coupled with another molecule, which moves against the gradient.
<u>The carrying capacity of a population</u> does not affect the spatial distribution of a population
Explanation:
The carrying capacity only affects the number of individuals of a population that the habitat or environment can sustainably support, because it allows for the resources to replenish themselves.
Spatial distribution is how the individuals of the population are distributed across the habitat. They could be clustered, uniform or un-uniform. Distribution could be affected by;
- the distribution of food and other resources
- abiotic conditions like rainfall and sunlight
- the existence of predators or parasites
Learn More:
For more on spatial distribution of a population check out;
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