Proteins, along with carbohydrates and lipids, are one of the three macronutrients. proteins are composed of amino acids, which are divided into two nutritional categories: essential and nonessential amino acids. each amino acid molecule consists of a central carbon, an amine group, an acid group, a hydrogen atom, and a side chain. choose the correct statement about essential, nonessential, and conditionally essential amino acids.

a. conditionally essential amino acids only need to be consumed every few months.
b. essential amino acids are found in food but can also be made by the body.
c. nonessential amino acids can be synthesized in the body, so they do not need to be consumed in the diet.
d. essential amino acids are not used to make proteins
e. there are 20 essential amino acids.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.