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Anna71 [15]
3 years ago
8

Which portion of the cell membrane is responsible for preventing unwanted materials from entering the cell?

Biology
1 answer:
kati45 [8]3 years ago
8 0
Lysosomes, dead organelles, waste products and other unwanted substances are removed through lysosomes
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Many male birds will expend A great deal of energy building nests. Females will mate with the males who build the best nest. Thi
crimeas [40]

Answer:

B

Explanation:

6 0
3 years ago
a tracheostomy may be indicated for which injury? a. laryngeal injury b. bronchial injury c. esophageal injury d. diaphragmatic
dezoksy [38]

The following injury may require a tracheostomy, according to the statement.

The best option is A.

Laryngeal injuries can be treated with intubation, cricothyrotomy, or tracheostomy. A bronchial damage is treated by bronchoscopy and conceivably with surgical repair. Esophageal injuries require immediate surgical treatment. Gastric tube insertion and surgical repair are required for the treatment of a diaphragmatic injury.

<h3>What is a tracheostomy?</h3>

A tracheostomy is a hole drilled into the front of the neck that enables tracheal intubation. If necessary, the tube can be connected to a ventilator, a mechanical breathing device, and an oxygen source.

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7 0
1 year ago
The existence of introns in mRNA-encoding genes seems to be a problem because so much cellular energy goes into splicing them ou
Svetllana [295]

Answer:

In normal conditions, introns serve following functions in the body of an organism:

1) They contain genes of miRNA which are known as Mirtrons, reverse transcriptase, endonucleases, transposase etc.

2) It is because of presence of introns that alternative splicing of mRNA is possible. The sex determination in drosophila is based on alternative splicing.

Apart from this, alternative splicing can be useful and beneficial in an unforeseen situation such as an environmental problem which is faced by the organism for the first time.

Explanation:

Alternative splicing is an important mechanism because with the help of alternative splicing different type of proteins can be synthesized from the same pre mRNA transcript. In case suddenly the surrounding environment of an organism is changed and the environmental conditions have become extremely harsh due to which organism's life is at stake, in such situation organism may make a different type of protein through alternative splicing which can help the organism in survival.  

Default splicing in Drosophila leads to the development of male off-spring while female off-spring is produced as a result of alternative splicing.  

8 0
3 years ago
All organic molecules contain both<br> and<br> atoms
kow [346]

Answer:

true

Explanation:

3 0
3 years ago
A scientist isolates a gene from a human cell that codes for a specific protein. The gene is inserted into a bacterial plasmid i
Elden [556K]
The correct answer for the question that is being presented above is this one: "Synthesized." A scientist isolates a gene from a human cell that codes for a specific protein. The gene is inserted into a bacterial plasmid in order to mass produce the protein for medical purposes. The next step in mass production of the protein would be synthesized of the bacterium containing the modified plasmid.<span>
</span>
6 0
3 years ago
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