Answer:
have similar cell structures
Explanation:
Archaea and bacteria are single-cell organisms that are classified as prokaryotes. They both possess similar cell structures as they tend to both have the same shape and size when viewed with a microscope. They both do not have a nucleus or other membrane-bound organelles like mitochondria and chloroplasts. One of the structures they share in common is the thread-like structure called flagella, which they use as in navigation around their environment.
Irrespective of the fact that they have similar cell structure, advanced studies have shown that archaea and bacteria have different genetic coding made of different proteins. Both cells also differ in the composition of their cell walls.
Biodiversity i just did this question on apex
It makes an area strongly composed of Oxygen and air vapor.
Answer:
D. Calcium ions.
Explanation:
Here we are talking about the mechanism of muscle contraction. The most accepted theory of muscle contraction is sliding filament theory. It was given by Huxley and Huxley. During the process actin filaments slides over myosin filament by forming cross bridges. The sequence of events are as follows:
a. An action potential propagates through the motor nerve and reach the nerve endings on the muscle fiber at neuro-muscular junction.
b. Neurotransmitter called acetylcholine is released by the nerve endings.
c. Acetylcholine binds to the receptors on muscle fiber and opens the gated channels which causes flow of Na+ ions into the muscle fiber.
d. This influx of sodium ions initiates an action potential in the muscle fiber which reaches the T- tubules or transverse tubules. Here it causes the sarcoplasmic reticulum to release large amounts of calcium ion.
e. Calcium ions are responsible for initiating the attractive forces between actin and myosin filaments. Cross bridges are formed, actin slides over myosin causing the contraction of muscle.
<span>The answer is transitional phase
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