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kipiarov [429]
3 years ago
6

Light energy is converted into this type of energy usable by all organisms

Biology
1 answer:
Levart [38]3 years ago
4 0

Answer:

photosynthesis

Explanation:

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Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
yaroslaw [1]

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

3 0
3 years ago
Which illness is most closely associated with time-temperature abused rice or other starchy foods?
pav-90 [236]
The answer is <span>Bacillus cereus

It is a bacteria responsible for some foodborne illnesses that can be found on rice products, potatoes, and pasta. This can be prevented through time and temperature control. The effect on a person having this kind of bacteria is nausea and diarrhea. 

One solution to prevent this is to give the right temperature through right cooling so germs cannot multiply. </span>
3 0
3 years ago
many cacti, such as saguaros and barrel cacti, have large stems and no leaves. what function of leaves is taken on by the stems
velikii [3]
<span>well i take this test before and the correct answer is :A They produce food by photosynthesis</span>
3 0
3 years ago
Small, wandering cells that engulf cell debris and pathogens in the CNS are called
Marrrta [24]

Answer:

D. Microglia

Explanation:

Microglia are phagocytic, which means that they are cells that can engulf other cells and particles. Microglia protect the CNS by engulfing foreign particles and bacteria. They act also as a clean-up crew that help remove dead cells. They are found in both the brain and spinal cord, which make up the Central Nervous System, or the CNS.

3 0
3 years ago
What are the four steps that occur during m phase
MA_775_DIABLO [31]

Answer:

prophase, metaphase, anaphase, and telophase

Explanation:

6 0
2 years ago
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