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Rom4ik [11]
3 years ago
13

What is responsible for creating wind and keeping everything in the solar system in its clutches?

Biology
1 answer:
laila [671]3 years ago
6 0
If you look at Cosmos episode 1, I'm sure you find an answer there. 
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In addition to identifying the genetic material, the experiments of Avery, MacLeod, and McCarty with different strains of Strept
guajiro [1.7K]

Answer:

DNA may be taken up by bacterial cells and be active.

Explanation:

To understand Avery, MacLeod, and McCarty's experiment, it is important to know Frederick Griffith's precursor experiment. The microbiologist worked at the British Ministry of Health's Pathology Laboratory with pneumococci (commonly known as the bacterium Streptococcus pneumoniae, then known as Pneumococcus, which causes pneumonia), which were previously classified into several types. When cultured in petri dishes in the laboratory, the pneumococci that synthesize their capsules generate 'smooth' colonies. Subcutaneous injection of liquid culture of these pneumococci into mice causes their death.  However, in vitro culture also allows the emergence of rough colonies', whose bacteria have lost the ability to synthesize mucopolysaccharide (and therefore have no capsules). Rough mutants could no longer be classified with sera and, moreover, lost their virulence: mice inoculated with them remained alive, unlike inoculated with smooth pneumococci.

The nature of Griffith's transforming principle remained unclear until the work of Avery, MacLeod, and McCarty. They repeated the in vitro transformation of pneumococci at the Rockfeller Institute for Medical Research, but replaced heat-dead cells with a purified fraction of smooth bacterial extract (unable to cause disease alone) and treated the material with different enzymes, each capable of destroying a specific type of macromolecule.  Experience has shown that this fraction retained its transforming capacity when treated with protein or RNA degrading enzymes, but lost that ability when treated with DNA degrading enzymes. These results indicated that the chemical nature of the 'transforming principle' was DNA.

Thus, we can conclude that in addition to identifying genetic material, Avery, MacLeod and McCarty experiments with different strains of Streptococcus pneumoniae demonstrated that DNA can be absorbed by bacterial cells and be active.

8 0
3 years ago
What element has 81 protons in the nuclei of its atoms
alex41 [277]
The atomic number reflects how many electrons there are, and there must be an equal charge<span>. therefore, there are the same amount of protons as there are electrons. so if it has 81 protons, we look for number 81 in the </span>periodic<span> table, Thallium</span><span>Thallium is the answer to this

</span>
6 0
3 years ago
Read 2 more answers
The length of a DNA double helix increases by 0.34 nm (nanometres) for every pair of nucleotides. The total number of nucleotide
taurus [48]

Answer:

If you multiple 1.02 × 2 = 2.04 meter, it is the total length of DNA in human diploid cells.

Explanation:

6 0
2 years ago
How much atp is produced from one glucose molecule if no oxygen is available to a muscle cell during contraction?
andrew11 [14]
Production of ATP in the absence of oxygen is called anearobic respiration. Under anaerobic respiration,two molecules of ATP is produced from one molecule of glucose. These ATP are used for energy production by the contracting muscles.
6 0
3 years ago
Put the events of keratinization in order.
vodka [1.7K]

Answer: A. Accumulate keratohyalin granules. B. Cells increase in size, some retain ability to divide. C. Cell membrane thickens. Cells imbedded in lipid matrix. D. Cells within this layer proliferate.

Explanation:

5 0
3 years ago
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