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Alinara [238K]
3 years ago
9

What are CD4+ cells?

Biology
1 answer:
telo118 [61]3 years ago
4 0
The answer is <span>B.  immune cells that are destroyed by HIV 

CD4+ are immune cells (white blood cells) and are an important part of the immune system. Their name comes from the presence of CD4 glycoprotein on their surface. HIV uses CD4 glycoproteins on the surface of CD4+ cells to entry into the cells. The consequence is a reduced number of those cells. Therefore, CD4+ immune cells are destroyed by HIV.</span>
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The release of an inorganic phosphate from the myosin molecule directly results in ________
zhuklara [117]

Answer:

power stroke

Explanation:

  • The process of muscle contraction requires several steps.
  • The most famous theory on how the contraction and relaxation of muscles take place is the sliding filament theory.
  • However, this theory has been refined and one important addition to it is the mechanism by which myosin can pull actin and cause shortening of the sarcomere.
  • For the movement of myosin, it binds and releases actin and forms cross bridges.
  • Myosin is subdivided into two regions - S1 and S2. The contraction of the S1 region is what constitutes the power stroke.
  • An important requirement of the power stroke is the hydrolysis of ATP to release an inorganic phosphate which provides energy for the process.
3 0
3 years ago
What is the function of the cytoplasm?
trasher [3.6K]
Function of Cytoplasm. The jelly-like fluid that fills a cell is called cytoplasm. It is made up of mostly water and salt. Cytoplasm is present within the cell membrane of all cell types and contains all organelles and cell parts. ... It helps to fill out the cell and keeps organelles in their place.
4 0
3 years ago
Read 2 more answers
Which cells of the nervous system protect the cns by phagocytosing viruses, microorganisms, and tumor cells?
alexandr402 [8]
The correct answer is microglia.
<span>Microglia is glial cells found in the central nervous system with the protective role. Because they are the resident macrophage cells, they act as the first and main form of active immune defense. Microglia is constantly cleaning the CNS for plaques, damaged or unnecessary neurons, and infectious agents, like viruses or other microorganisms.</span>
3 0
3 years ago
How can you tell if an older rock is above a younger rock? explain.
kozerog [31]
The younger rock would be black and have like no stains and it would not be as dirty as the older rock hope this helps!!1
8 0
3 years ago
Throughout the reflection, make sure you have a copy of the student guide and your data tables. use the drop-down menus to compl
RSB [31]

The value of the dependent variable is based upon changes in the values of the independent variable.

<h3>What is the dependent and independent variable?</h3>

The term independent variable has to do with the variable that is being intentionally manipulated in an experiment. The dependent variable is the variable that changes in value as the independent variable is manipulated.

Now, the question is unclear however, we do know that in an experiment, the value of the dependent variable is based upon changes in the values of the independent variable.

Learn more  about independent variables:

brainly.com/question/1479694

#SPJ1

3 0
2 years ago
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