Since we cannot see magnetic forces, what do scientists and engineers use to show them on a magnetic model?

1 answer:

4 0

You can use a plotting compass or iron filings to detect a magnetic field:

1.put a piece of paper over a magnet (this stops the iron filings sticking to the magnet)

2. sprinkle iron filings onto the paper

3.gently tap the paper to spread the filings out

4.observe and record the results

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The cells involved in innate immunity, whose absence increases the chances of developing malignant tumors, are _____.

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Answer:

The correct option is B (natural killer cells).

Explanation:

Natural killer cells: They are defined as the type of cytotoxic lymphocyte which are critical to the innate immune system. The NK cells play an important role in to provide rapid response to tumor formation, virus infected cells, and acting after three days of infection.

While cancer cells die, they release some antigens, than these antigens are recognized by the immune system, and later they are presented on the immune cells which are known as antigen presenting cells. So, if these cells are absent than they increase the chances of developing malignant tumors.

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DNA contains the template needed to copy itself, but it has no catalytic activity in cells. What catalyzes the formation of phos

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DNA polymerases

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The formation of a phosphodiester bond between adjacent nucleotides is catalyzed by the DNA polymerases. They do this efficiently only if the incoming base on the incoming nucleoside triphosphate is complementary to the base on the template strand and can bind efficiently.

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What’s the monomers of nucleic Acids ?

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The answer is nucleotides

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4. Which pathway represents the flow of electrons during photosynthesis? (1 point) A.) H2O > Photosystem I > Photosystem I

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Answer:

4. The correct pathway for the flow of electron during photosynthesis is mentioned in option D. $H_{2}O$ > <em>NADP </em>> <em>Calvin cycle.</em>

Electron is first provided to the photo-system II by the phtolysis of water.
Then it is passed to photo-system I with the help of plastoquinone (PQ) and cytochrome $b_{6}f$ .
Finally, electron from the photo-system II is used to reduce NADP to NADPH.
NADPH and ATP are used in light independent phase or Calvin cycle to synthesize carbohydrate from carbon dioxide.

5. The correct answer is B.) photosynthesis.

Photosynthesis is the process by which green plants synthesize glucose or carbohydrate from carbon dioxide and water in presence of sunlight and chlorophyll.
In light independent phase of photosynthesis, it requires ATP and NADPH in order to synthesize food.
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Where would you most likely find benthos organisms?

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C . on or in the ocean bottom

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