Answer: For building amino acids, proteins and nucleic acids.
Explanation:
Living cells requires nitrogen because they are major part of amino acids. They form the building block of protein and nucleic acids such as DNA which carry the genetic information and is passed from generations to generations. Plants and animal need nitrogen for growth and survival. The protein is use for building and repairing muscles and it is a necessity for growth.
Answer:
- Modern camels are more related to Camelops than to Aepycamelus.
- Pliauchenia and Oxydactylus may share similar feautres.
- Procamelus and Stenomylous may share similar features.
Explanation:
The chart given explains how the camels are evolved between Eocene (33 myo) and Pleistocene.
- According to the chart, modern-day camels (Camelus) are a closer phylogenetic relative of Camelops because they are clustered together in the Pleistocene age section. However, Aepycamelus is last recorded in the Upper Miocene and later became extinct (or no record is found in Pliocene and Pleistocene).
- Pliauchenia and Oxydactylus have a single ancestor "Protylopus" which can be seen in the Eocene age. Although Protylopus were branched to two species in upper Miocene, it is not difficult to believe that they share many genetic similarities (features) in both lineages.
- Similarly, Procamelus and Stenomylous are the descendants of Poebrotherium and got apart at the end of the Oligocene, therefore, they will also share several features similar to each other.
Answer:
A sphere full of air
Explanation:
because you pump it up and it is very fun to use
Answer:
- Calcium binds to troponin C
- Troponin T moves tropomyosin and unblocks the binding sites
- Myosin heads join to the actin forming cross-bridges
- ATP turns into ADP and inorganic phosphate and releases energy
- The energy is used to impulse myofilaments slide producing a power stroke
- ADP is released and a new ATP joins the myosin heads and breaks the bindings to the actin filament
- ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, starting a new cycle
- Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
Explanation:
In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing <u>calcium into the sarcolemma.</u> At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join to the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament. Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
<span>Sodium channels close when not occupied
</span><span>Sodium ions diffuse through and enter the cell.
</span>
Then they leave the cell.
The sodium diverts in the cell layer have receptor locales for acetylcholine.
