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Annette [7]
3 years ago
6

Chargaff's rules of DNA structure states that

Biology
1 answer:
nikklg [1K]3 years ago
3 0
What is the question?
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Age-associated changes in the immune system, also known as _______________________, are thought to be responsible for the increa
wariber [46]

Answer:

The correct answer is: Immunosenescence.

Explanation:

  • Immunosenescence can be defined as a biological age-related phenomenon due to which the cells of the immune system are unable to function efficiently with increase in age.
  • As a result of this the aged individuals becomes susceptible to various infections and diseases.
  • This happens because of the following reasons:
  1. The immune cells are formed from the progenitor cells called the Hematopoetic Stem Cells (HSCs) which are abundantly found in the bone marrow. These cells have the capacity of self-renewal and also differentiation into various types of immune cells. Due to aging, these cells accumulate large number of Reactive Oxygen Species (ROS) that that causes oxidative damage to the DNA. Also, with age the telomere (the repititive DNA sequence located at the chromosome terminal that protects the end of the chromosome from undergoing recombination or fusion with other chromosomes) length shortens resulting in the generation of damage in DNA. All these reduces the self renewal and differentiation capacity of these cells.
  2. Other cells of the immune system like, the white blood cells, anti-body producing B-cells, cytotoxicity inducing T-cells, natural killer cells also accumulate similar DNA degrading components. This reduces their life time and also the efficiency of their activity.
5 0
3 years ago
Which of the following is an example of mechanical weathering
professor190 [17]

Answer:

Examples of mechanical weathering include frost and salt wedging, unloading and exfoliation, water and wind abrasion, impacts and collisions, and biological actions. All of these processes break rocks into smaller pieces without changing the physical composition of the rock.

Explanation:

Mechanical weathering involves mechanical processes that break up a rock: for example, ice freezing and expanding in cracks in the rock; tree roots growing in similar cracks; expansion and contraction of rock in areas with high daytime and low nighttime temperatures; cracking of rocks in forest fires, and so forth.

7 0
3 years ago
Which of the following is not an example of an extensive physical property? Select one:
nekit [7.7K]
Oi belive the answer is d

6 0
3 years ago
Read 2 more answers
Based on the graph above, how well will the enzyme perform as a catalyst when placed in a pH 7 solution, such as water?
mrs_skeptik [129]
The correct answer is "<span>It will perform less than optimally unless the pH was increased."

This is because the curve on the graph shows pH versus reaction rate. If we follow the x-axis (the bottom one) to a pH of 7, it is at an extremely low reaction rate compared to other points of the graph. If we continue along, we see that the reaction rate increases as the pH increases. Therefore, the enzyme will perform less than optimally unless the pH is increased.

Hope this helps, and hope I'm the brainiest! :)</span>
3 0
3 years ago
They are unicellular prokaryotes with a cell wall what are they
sertanlavr [38]

Organisms in this kingdom can live in EXTREME environments.Angiosperms, gymnosperms, liverworts, and ferns are included in this kingdom

8 0
3 years ago
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