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Lynna [10]
3 years ago
8

Who developed the hypothesis that cells only come from other cells?

Biology
1 answer:
Katena32 [7]3 years ago
5 0

Answer:

Rudolf virchow in 1855

Explanation:

He said omnis cellula - e - cellula.

Mean cells formed from pre existing cells.

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Why do vaccines work for some diseases but not others?
otez555 [7]

Answer:

The antibodies produced by a vaccine only fight specific antigens.

Explanation:

Antibodies only bind to specific antigen during an immune reaction. The introduction of foreign substance in the body stimulate the B-cells to produce antibodies that fight against infections. Only specific antibodies are produced following antigen presenting cells that bind to antigens. They capture and display the antigens to the antibodies.

3 0
3 years ago
Read 2 more answers
"Antigenic Shift" is a characteristic of the causal agent of the Influenza. It is the result of a major change in the antigenic
gtnhenbr [62]

Answer:

True.

Explanation:

Antigen may be defined as the chemical that has the ability to evoke the  and immune response and can harm the living organisms. The specific antibody are produced against the immune response.

The antigens has evolved different mechanisms to prevent themselves from them the immune system of the host. The antigenic shift is the most common change that might occur in viruses that helps the antigen to protect itself by changing its genetic material. No anti viral drugs are available for the viruses.

Thus, the answer is true.

4 0
3 years ago
Which of the following is not a product of the light reactions of photosynthesis? 1) NADPH 2) NADH 3) ATP 4) Oxygen
n200080 [17]

Answer:

The correct option is number 2. NADH is not  product of light reactions of photosynthesis.

Explanation:

The light energy from the sun is captured by the pigmented molecule, chlorophyll, of the plants. This light energy is converted into chemical energy by a serious of light-dependent reactions. The main products of light-dependent reactions are the energy molecule ATP and NADPH. Oxygen is released as a by-product during photosynthesis. Hence, all the option 1,3 and 4 are produced during the light reactions except for option 2 i.e NADH.

5 0
3 years ago
To stop cockroaches, what can the human species do?
miss Akunina [59]
Use pesticides, kill the cockroaches

use cockroaches for research XD

and other than that, live in harmony with them i guess?

nothing else you could really do about it
7 0
3 years ago
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If the substance entering the cell was in higher consonstration inside the cell than outside the cell ,what type of transport wo
nignag [31]
<span>Facilitated diffusion

Diffusion occurs because of the movement of molecules from the region of higher concentration to the region of lower concentration. This movement of molecules occurs due to a thermal motion. Diffusion normally occurs between two compartments having difference in concentration. In case of fluid it moves from the region of higher concentration to the region of concentration until a balance is reached. The process of diffusion is very important for the humans as well. The oxygen that humans breathe in gets diffused with the blood.<span> </span></span>
3 0
3 years ago
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