Answer: DNA contains alternating sugar-phosphate molecules whereas RNA does not contain sugars
Explanation:
Answer:anser is b have a good one
Explanation:
<u>ANSWER:</u>
The muscles and joints allow the hands to perform their function of holding and grasping a wide variety of things.
<u>EXPLANATION:</u>
- The structure of hands is "very delicate and complex". The tendons, nerve fibres, tissues and thin muscles are located right under the skin.
- The bones of the hand including the 4 carpal bones, 5 metacarpal and 14 finger bones are all connected by joints and ligaments and these allow the hand to grasp things.
- The wrist is made of "two parts of a joint" that allow the extension and stretching of hands.
Answer:
Food web
Explanation:
food web:
a system of interlocking and interdependent food chains.
Answer:
A) the concentration of calcium ions in the sarcoplasm of a resting muscle
Explanation:
Sarcoplasmic reticulum is a system of the membranous sac that is present around each myofibril and is filled with calcium ions. When muscles are in the resting stage, calcium ions are stored in the sarcoplasmic reticulum.
As the muscle action potential triggers change in voltage-gated calcium ion channels of the sarcoplasmic reticulum, the channels are opened to release the calcium ions in the sarcoplasm. Increased calcium ion levels in sarcoplasm make the muscle fibers to contract.
Removal of acetylcholine from the synaptic cleft ends the production of muscle action potential and calcium ions are moved back from the sarcoplasmic reticulum.
Hence, lower levels of calcium ions are maintained in sarcoplasm when the muscles are in the resting stage.
