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meriva
3 years ago
11

Macrophage cells undergo a process called phagocytosis in which material is brought into a cell in the form of membrane vesicles

and then transported along microtubules toward the cell center. Assuming that the centrosome is near the cell center, you can predict that these vesicles are moving to the _____ end of microtubules using the motor protein _____.
A. minus end; dynein
B. plus end; kinesin
C. minus end; kinesin
D. plus end; dynein
Biology
1 answer:
Naddik [55]3 years ago
4 0

The correct answer is: A. minus end; dynein

Microtubules are cytoskeletal fibers that have an important role in the intracellular transport (movement of vesicles within the cell) and in the mitotic spindle during mitosis. The plus end of the microtubules extend through the periphery of the cells while the minus ends are anchored within the centrosome.

Necessary proteins for the vesicle’s movement are motor proteins:

• kinesin  which is positive end directed

•  dynein which is negative end directed

So, beside vesicles these proteins are also involved in organelles’ transport in opposite directions through the cytoplasm.

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3 years ago
Choose any one of the consumer services companies and write an essay of about 500 words on how a diverse economy such as the Uni
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let's take the example of Walmart, which has the large presence in the United States and is an important part of the Consumer Services Industry.

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Walmart began with just one store but has grown all over the country to many unique aspects of the American economy and demographics. The United States, in contrast to what many people assume, is a very diverse country.

The culture of New England is very different from that of the Bible belt. Similarly, the African American culture of Georgia is different from the casual California where there is a vast Hispanic population.

Walmart saw an opportunity in this diversity and has grown by catering to needs of all these consumers. Communities with highly dense Hispanic population stocked food items that were very different than can be found in Jewish neighbourhoods and vice verse.

This enabled Walmart to connect with each community and grow with them over the generations.

In all this, Walmart prides itself in providing benefits to US army veterans and provides jobs to women from low-income backgrounds and the disabled.

In all this, Walmart does face a number of different challenges, including:

A slowing economy can hit the profits of the company

Competition from other companies such as Costco and even international players like Aldi and Lidl can decrease their market share

Online rivals such as Amazon have long been identified as a threat to the company and is one of the biggest challenges facing the consumer service industry.

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6 0
2 years ago
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When new mountains or plateaus form, the cycle starts over. Weathering is the breakdown of rocks by the weathering agents. These sediments move due to the process of erosion. A new sediment may be dropped nearby or in a new place by the process of deposition. Weathering, erosion and deposition occur together as a cycle and have almost leveled the land surface.

Weathering, erosion and deposition have almost leveled earth’s surface. These three processes occur as a cycle and have almost leveled the land surface.


3 0
3 years ago
Read 2 more answers
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