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Ulleksa [173]
3 years ago
12

Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier?

Biology
1 answer:
NISA [10]3 years ago
3 0

Answer:

Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier? D) Inducing TNF

Explanation:

The blood brain barrier is a barrier formed by brain microvascular endothelial cells, astrocytes and pericytes. Pathogens can cross this barrier by using different mechanisms. The Tumor Necrosis Factor (TNF) is the way gram-negative bacteria cross this mentioned blood-brain barrier.

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Why is a cap added to mRNA, but not to tRNA or rRNA? Transfer RNA and rRNA exhibit complex structures with double stranded regio
DaniilM [7]

Answer:

The 5' cap is added to the mRNA as a means of protection from being degraded by enzymes in the cellular environment. Additionally. it helps with binding to the ribosome and subsequently translating it into a protein.

Explanation:

Moreover, it's only Polymerase II that has the ability to add the 5' cap and rRNA & tRNA are not transcribed by Polymerase II, only the mRNA is.

rRNA and tRNA have stable 3-Dimensional structures that protects it from being degraded by enzymes.

Hope that answers the question, have a great day!

5 0
3 years ago
The upper gastrointestinal tract consists of the following structures/organs:
lara [203]

Answer: The upper gastrointestinal tracts organs consist Esophagus, stomach and duodenum.

Explanation:

Gastrointestinal tracts is a organ system found in human beings and other animals that deals with intake of food, digestion of food, adsorbing nutrients from the digested food and expelling or excreting the waste products and undigested food.

The gastrointestinal tracts is divided into two, the upper and lower gastrointestinal tracts. The upper gastrointestinal tracts organs consist of Esophagus, stomach and duodenum while the lower gastrointestinal tracts consist of the large and small intestine. The structures include anus, colon,rectum,caecum.

6 0
2 years ago
Describe the carbon atom:
Tamiku [17]
A sole carbon particle: The degradation of particulate organic matter in the ocean is a central process in the global carbon cycle, the mode and tempo of which is determined by the bacterial communities that assemble on particle surfaces.
5 0
3 years ago
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2. A student ran around a circular track. Which statement best describes the motion of the student while running?​
Artist 52 [7]

Answer:

Circle-ular

Explanation:

~

6 0
2 years ago
Natural selection is an evolutionary mechanism by which _______.
torisob [31]

Answer: The correct answer for the fill in the blank is B) Advantageous traits become more common in a population.

Theory of natural selection was given by Darwin. This is one of the mechanisms of evolution.

According to this theory, organisms that are better adapted to their environmental conditions survive and increase their population by reproduction. So they pass the advantageous trait to the next generation. In other words, it reflects the survival of the fittest.

Due to this, the advantageous trait becomes more common in the population.

Thus, the correct option is B)

8 0
2 years ago
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