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Elis [28]
3 years ago
14

Scientists are uncertain about how life began on Earth.Why?​

Biology
1 answer:
Ksju [112]3 years ago
6 0
By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
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Can you put leave in conditioner on dry hair
Marysya12 [62]

You can, but I don't recommend it. Conditioner should only be used for damp or wet hair. If used on dry hair, it could ruin.

Hope this helps!

7 0
3 years ago
Explain the purposes of gene expression studies. Describe the use of DNA microarray assays and explain how they facilitate such
denis-greek [22]

Answer:

Both gene expression and DNA micro array study about the expression of gene during different stages of development.

Explanation:

The main purpose of gene expression studies is to determine the level of mRNA expressed at different stages of transcription in a tissue or at different stages of cellular development. If a gene is not “ON” during synthesis of RNA and protein, then the desired proteins are not produced. Such studies allow us to turn on such genes.  

DNA microarray  assays easily identify and determine the network of gene expression across the entire genome. The common application of DNA microarray include – mutation analysis and detection, assessment of gene cop, immunoassays etc.

4 0
3 years ago
McHutchison JG, Runyon BA. Spontaneous bacterial peritonitis. In: Gastrointestinal and Hepatic Infections, Surawicz CM, Owen RL
lyudmila [28]

SBP is a serious complication in patients with cirrhosis with high mortality rates (20–40%).

Patients at risk of developing SBP can be categorized in three groups firstly patients with active variceal bleeding patients with ascitic fluid protein <10 g/dl secondly those with a prior episode of SBP.

The most common bacteria causing SBP are gram-negative Escherichia coli and Klebsiella pneumoniae and gram-positive Streptococcus pneumoniae usually only a single organism is involved. Spontaneous bacterial peritonitis (SBP), an infection of ascitic fluid without a definitive intra-abdominal source that can be surgically treated is a common complication in patients with cirrhosis and ascites. Spontaneous bacterial peritonitis (SBP),is treated with a 10 to 14 day course of antibiotics .

To learn more about Spontaneous bacterial peritonitis (SBP) , here

brainly.com/question/13258891

#SPJ4

3 0
2 years ago
Which statement correctly describe one similarity between cellular respiration and photosynthesis?
Vitek1552 [10]
B. Plz follow and brainliest
7 0
3 years ago
In negative control of transcription by the lac operon, how does the presence of an inducer affect transcription?.
ss7ja [257]

If the inducer [allolactose] is present in the negative control then it will bind to the repressor decreasing its ability to bind to the operator due to which the transcription begins again and the operon is turned on.

Lac Operon is a set of three genes z, y & a which are regulated under the same promoter which regulates the amount of lactose production in the cell.

An inducer is a molecule that has the ability to induce or activate the operon. ex- in the case of the lac operon, allolactose acts as an inducer.

A repressor is a molecule that will repress or restricts the transcription of the genes of the operon, as a result, the operon will be switched off.

When the lac operon is under negative control, with no CAP [catabolite repressor protein] binding activity, the repressor remains active and thus binds to the operator region of the operon, as a result, no transcription takes place and the operon will be switched off.

But if the inducer will be present even in the negative control then the transcription takes place and the operon will be on.

Learn more about lac operon here

brainly.com/question/19596166

#SPJ4

4 0
2 years ago
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