Answer:
B. Use the polymerase chain reaction (PCR) to make multiple copies of the DNA.
Explanation:
The scientist is to analyze a small sample of DNA, the most useful step to start this would be first the use of polymerase chain reaction to make various copies of that DNA sample. PCR is essential and quick process that gives a lot of copies within few hours. It uses the sample or target DNA, according to which the primers are designed. Taq polymerase and DNA polymerase are also used in the process, it consist of various cycles in which copies are made. There are three basic steps 'Denaturation', 'annealing', and 'extension'.
Answer:
A) preoperational stage
Explanation:
The preoperational stage is the second stage in Piaget's theory of cognitive development. This stage begins around age 2, as children start to talk, and lasts until approximately age seven. During this stage, children begin to engage in symbolic play and learn to manipulate symbols.
(googles words, not mine)
Calcium and Vitamin D. Adults older than 70 need more calcium and vitamin D to help maintain bone health than they did in their younger years. ...
- Rough Endoplasmic Reticulum.
- Chloroplast.
- Cell wall.
- Mitochondria.
- Vacuole.
- Membrane
- Golgi Apparatus.
- Nucleus
- Nucleolus.
The cell in the diagram is a plant cell because it has chloroplasts and a cell wall.
There are two types of cells animal cells, which are the ones that humans and animals have, and plant cells, which are the ones that plants and trees have. They share some organelles, but they also have some that are specific to each type.
The plant cell parts in the picture are:
- Rough Endoplasmic Reticulum: it is where the ribosomes are. The synthesis of proteins happens there.
- Chloroplast: it is an organelle-specific of plant cells. They are in charge of photosynthesis.
- Cell wall: it is only present in plant cells. It surrounds the membrane.
- Mitochondria: It is the place that generates the energy that the cell needs.
- Vacuole: they are bigger in cell plants than in animal plants. It has many functions, but one is to store water.
- Membrane: it draws the limits of the cell.
- Golgi Apparatus: it is the place where proteins go to be distributed.
- Nucleus: it contains DNA, and it has a membrane around it.
- The nucleolus: is the larger part of the nucleus. It is in contact with the endoplasmic reticulum.
To sum up, the plant cell has a bigger vacuole than the animal cell; it also has chloroplasts and a cell wall, which are not present in the animal cell.
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brainly.com/question/18057281?referrer=searchResults
Answer:
<em>The </em><em>toxin </em><em>bind </em><em>to </em><em>receptors </em><em>on </em><em>the </em><em>surface</em><em> of</em><em> </em><em>susceptible</em><em> </em><em>cell </em><em>and </em><em>enter </em><em>them</em><em> </em><em>by </em><em>endocytic </em><em>uptake.</em><em> </em><em>.</em><em>.</em><em>.</em><em> </em><em>With </em><em>the </em><em>exception</em><em> </em><em>of </em><em>pore-</em><em>f</em><em>orming</em><em> </em><em>proteins</em><em> </em><em>toxins </em><em>which</em><em> </em><em>compromise</em><em> </em><em>the </em><em>permiability </em><em>barrier</em><em> </em><em>of </em><em>the </em><em>target</em><em> </em><em>cell </em><em>plasma </em><em>membrane</em><em>,</em><em> </em><em>the </em><em>bacterial </em><em>toxin </em><em>act </em><em>catalytically</em><em> </em><em>to </em><em>modify</em><em> </em><em>substrates </em><em>within</em><em> </em><em>mammalian </em><em>cells.</em>