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Luba_88 [7]
2 years ago
12

A(n) is a protein and/or sugar molecule on the surface of a cell that allows the immune system to identify whether or not that c

ell poses a threat.
Biology
1 answer:
Lapatulllka [165]2 years ago
7 0

Answer:

Antigen

Explanation:

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Which of the following is a plant adaptation to living in a cold climate?
NemiM [27]

Answer:

b. Vernalization

Explanation:

Vernalization is a phenomenon in which plants require low temperature for the flowering. There is either qualitatively or quantitatively dependent on exposure to very low temperature. This process is known as vernalization. Vernalization defines especially to the promotion of flowering by a period of  low climate. For example; Vernalisation occurs in biennial plants. Biennials are monocarpic plants which normally flower and may die in the second season. Some common examples of biennials are carrots, Sugarbeet, cabbages, etc.

6 0
3 years ago
how does the energy of the reactants and products differ between an energy absorbing reaction and an energy releasing reaction
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In an energy absorbing reaction, the energy of the products is greater than the energy of the reactants. In an energy releasing reaction, the energy of the reactants is greater than the energy of the products.
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3 years ago
Analyzing the following tree, prove the relationship between ray-finned fish and crocodiles using the characteristics given belo
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Answer:

The Ray- Finned Fish has a bony skeleton just like crocodiles. Crocodiles evolved more and adapted to their environment. Along the way Crocodiles grew to have four limbs, were born from an amniotic egg, and then their eggs also have shells, unlike the Ray-finned fish. Therefore the three characteristics they do NOT have in common are: Four Limbs, Amniotic Egg, and Eggs with Shells. The one trait they do have in common is Bony Skeletons. They also both have vertebrae.

7 0
3 years ago
What does photosynthesis produce (make) ?
Elan Coil [88]

Answer:

photosynthesis produce food for plants

8 0
2 years ago
How are humans immune to infectious diseases after they have already contracted the disease previously? and How do vaccinations
Varvara68 [4.7K]

Answer:

Explanation:

Immunity to a disease is achieved through the presence of antibodies to that disease in a person's system. Antibodies are proteins produced by the body to neutralize or destroy toxins or disease-carrying organisms. Antibodies are disease-specific. Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system's antibodies and other cells to target the invader. A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response. These molecules are called antigens, and they are present on all viruses and bacteria.  

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