Answer:
C. Concentration gradient
Answer:
e. bind to troponin which moves the tropomyosin.
Explanation:
Troponin (Tn) is a protein complex composed of three different proteins: troponin C (TnC), troponin I (TnI), and troponin T (TnT). This complex is found both in skeletal muscles and cardiac muscles, where TnC attaches calcium ions through four and three calcium ion-binding sites, respectively. When a muscle is relaxed, Tn attaches to tropomyosin to prevent muscle contraction. During muscle contraction, calcium channels open and cytosolic calcium ions bind to TnC, thereby Tn changes its conformation and moves the tropomyosin. This process relieves the inhibition of the interaction between actin and myosin filaments, which makes muscle contraction possible.
Answer: The cell membranes of a variety of different bacteria, fungi, animal and plant cells contain aquaporins through which water can flow more rapidly into and out of the cell than by diffusing through the phospholipid bilayer.
Explanation:
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The answer is d. atmosphere < leaves < roots < soil
<u>Answer:- </u> Decomposition
<u>Explanation:- </u>
Decomposition is a natural process that occurs in the environment to break down organic substances into simpler substances.
- All the living organisms that die, are decomposed and their bodies are broken down into simpler substances such that the nutrients are released into the soil.
- The plants are then able to absorb these nutrients from the soil and thus, the nutrient cycling goes on as the organisms feeds on it.
- Not only the dead animals but also the fallen leaves and other parts of the plant gets decomposed as they die.
- The process of decomposition is carried out by living organisms present in the soil such as bacteria. Such organisms are called as decomposers.
