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skad [1K]
3 years ago
7

Adult flatworms have _____ symmetry

Biology
1 answer:
sesenic [268]3 years ago
4 0

Answer:

bilateral Symmetry

Explanation :

Because only one plane can pass through Flatworms that segregate it into two equal halves

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A television works by transforming electrical energy into what other kinds of energy?
klasskru [66]

Answer: It is A

Explanation: It is A because the television gives off light and sometimes that could heat up the tv and it is sound because obviously television makes sounds because of the volume :) hopefully that helps.

8 0
2 years ago
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
2 years ago
Which two structures would provide a positive identification of a plant cell under a microscope?
Sonbull [250]
There are some organelles which are found in plant cells but which are not found in the animal cells, these structures will provide a positive identification of a plant cell under a microscope.
The structures which would provide a positive identification of a plant cell under a microscope are CENTRAL VACUOLE, CHLOROPLAST [PLASTIDS] AND CELL WALL. These structures are only present in plant cells.
5 0
3 years ago
Read 2 more answers
What is a difference between prokaryotic and eukaryotic cells? A. Prokaryotic cells do not have a nucleus, but eukaryotic cells
svet-max [94.6K]

Answer:

The correct answer is A

Explanation:

Eukaryotic cells have a nucleus containing their DNA, whereas prokaryotic cells do not have a nucleus.

8 0
3 years ago
Read 2 more answers
What does carbohydrates give to the body
ankoles [38]
Carbohydrates give energy to the body.

Hope this helps!!
5 0
3 years ago
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