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iren [92.7K]
2 years ago
14

To respond to a chemical signal, a cell must have a ? to which the signaling molecule can bind.

Biology
1 answer:
Sphinxa [80]2 years ago
4 0
A cell must have an atom
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What are the two processes used by producers to obtain energy
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Answer;
The two processes used by producers to obtain energy are photosynthesis and chemosynthesis.

Explanation; 
Producers are those organisms that can make their own energy in an ecosystem using biochemical processes. These biochemical processes are photosynthesis and chemosynthesis.
Photosynthesis involves use of energy from the sunlight together with water and oxygen to make simple sugars. The process converts solar energy to chemical energy (simple sugars). 
Chemosynthesis involves use of chemicals as the energy source, rather than sunlight , to make simple sugars such as glucose. 
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What type of immunity exists when a person is exposed to an antigen and subsequently makes antibodies against the antigen?
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Acquired immunity is the type of immunity that exists when a person is exposed to an antigen and subsequently makes antibodies against the antigen.

Immunity is the defense mechanism of the nervous system to avoid pathogens affecting the body and making it sick. There are two major types of immunity: innate and acquired. Innate immunity is the kind of immunity present in the human body by birth. Whereas, acquired immunity is gained over time.

Acquired immunity specifically promotes the antibodies or lymphocytes to inhibit the action of pathogens when it encounters one. It is further categorized into two types: active and passive immunity.

Active immunity indulges in the primary response to a pathogen. It produces antibodies to fight against it and preserves some to fight against the same pathogen encountered for the second time. Passive immunity, in addition, involves the medications prescribed to enhance immunity.

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Which of the following statements about Bacteria is FALSE?
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Oxygen is necessary for the growth of all bacteria.

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This statement is false, because not all bacteria require oxygen to produce energy and grow. The bacteria that need oxygen to grow are called aerobic bacteria. But there are also bacteria that can produce energy without oxygen, these are called anaerobic. Some bacteria can adapt to both environments, these are called facultative anaerobes bacteria.

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How is energy released from an ATP molecule ?
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When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP). Likewise, energy is also released when a phosphate is removed from ADP to form adenosine monophosphate (AMP)

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