This statement is true.
When a hormone binds to a hormone receptor it activates cell enzymes that start a cell cascade. This means that this enzyme makes changes in the activity other proteins or alters the expression of specific genes that change the cells activity.
Answer:
The models are missing in the question. The models along with the question is provided in the attachment below.
The answer is : Model A represents the Plasma membrane.
Explanation:
According to the question, model A represents the plasma membrane. The reasons are :
(a). In the model A, the bilayers consists of two leaflets of the amphipathic lipid molecules. Here the polar head groups is in contact with the intra cellular or the extra cellular non aqueous phase, where the non polar tails are facing each other constituting the hydrophobic interior of the membrane.
(b). Lipid are not rigid as well as static structure. In the lipid bilayer, the lipid molecule are able to rotate around their axis freely and diffuse laterally with each leaflet.
(c). The plasma membrane acts as the selective plasma membrane.
If a cell has 18 chromosomes the daughter cells would have 18 chromosomes after mitosis.
c. 18
<u>Explanation:</u>
Mitosis is the DNA replication process which maintains the number of chromosomes in daughter cells equal to number of chromosomes in parent cell. In the process the parent cell divides into two daughter cells having the same chromosome number as that of parent cell.
Meiosis is a process different from that of mitosis where each parent cell divides into four daughter cells having half the number of chromosomes present in the parent cell.
Since sex cells have to be haploid in organisms like human beings, it is the process of meiosis that takes place in reproductive cells.
Excess nitrogen can also leach or drain from the soil into underground water sources, or it can enter aquatic systems as above ground runoff. This excess nitrogen can build up, leading to a process called eutrophication.
Answer:
The desired graph of the Antarctic food web is attached:
Explanation:
A food web shows the taking care of connections between the life forms in a specific biological system, fundamentally what eats what. It shows how vitality courses through the biological system. Creatures can be separated into producers, different level of consumers, and decomposers inside a food web:
producers in the Antarctic marine biological system are: ocean ice green growth, phytoplankton, macroalgae, microalgae
primary, second-level, third level, fourth level, and fifth-degree of consumers are straightforwardly or by implication rely upon producers as they structure a significant food hotspot for creatures that feed by grazing. Models incorporate snails, imps, and corals. These consumers thusly will be eaten by different creatures, for example, ocean stars. At the head of the food web, there are bigger consumers, for example, fish, penguins, and seals. energy moves from producers to the consumers and there is a large part of the energy loss during the process only 10% of energy gets to the subsequent trophic level.