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4 0

T cell activation is initiated by an activated B cell.

The B cell presents antigens on its MHC receptors. The T cell recognizes the antigen bound to the MHC. There are other cosignals that fully activate the at cells but the antigen on the MHC receptor on the B cell is where it all starts.

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What happens when a cold front replaces a warm front

frozen [14]

Answer:

When a cold front overtakes a warm front, it creates what's called an occluded front that forces warm air above a frontal boundary of cooler air masses.

Explanation:

The presence of a cold front means that cold air is advancing and pushing underneath warmer air. This is because the cold air is ‘heavier,’ or denser, than the warm air. Cold air is thus replacing warm air at the surface.

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1 year ago

DNA is the genetic material that makes up living things, and folic acid plays an important role in the formation of DNA. Jon wan

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<span>The variables in this study would be the folic acid used (the independent variable) and the DNA formed through the implementation (the dependent variable). By changing the amount of folic acid used in the experiment, the DNA will possibly be changed in the microbes.</span>

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3 years ago

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In the above diagram of a plant cell, what is the function of structure 3?

kramer

Explanation:

B. serves as the control center of the cell and contains the cell's genetic information

All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wounucleuscarbohynd around histones as chromosomes. Chromosomes within the nucleus is unwound, unzipped and read by enzymes in a complex series of steps known as transcription. The message on DNA, called genes is copied by RNA polymerase, to form mRNA complementary sequence to that of the DNA strand. These are then translated into proteins in ribosomes.

Further Explanation:

A cell's structural components (i.e. their makeup) determine their function (what they do) . For instance, photosynthesizing cells in algae and plants have structures called chloroplasts. These contain chlorophyll, a specialized compound which facilitates the conversion of light energy to energy stored in carbohydrates. In specific cell types, collected proteins may function as a unit called an organelle. Some organelles are bound by membranes like those that make up the external structure of the cell, with varying compositions of phospholipids and proteins. These are advantageous, as they:

may increase metabolic reaction efficiency; they allow cells to concentrates smaller fractions of enzymes and solutes
separate proteins and molecules that me harm the cell by parceling them into membrane-bound organelles for example, proteaseas bound within lysosomes can break down many structural proteins

Learn more about cellular life at brainly.com/question/11259903

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3 years ago

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Svetlanka [38]

Answer:

A. produce larger materials from the collision of smaller materials

Explanation:

The outcome of nuclear fusion reaction is that it produces larger materials from the collision of smaller materials.

Nuclear fusion is the combination of small atomic nuclei into larger ones with the release of a large amount of energy.
The energy released provides the needed temperature for another set of atoms to fuse.
This process in turn yields a bulkier material accompanied with the release of a lot of energy.

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3 years ago

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Yuri [45]

hemistry is the "scientific study of matter, its properties, and interactions with other matter and with energy". ... It is an experimental science in which theories are developed and tested against observations. The goals of physics include explaining and predicting how the universe works. Biology is the study of life.

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