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svlad2 [7]
3 years ago
14

How did eukaryotic cells originate?​

Biology
1 answer:
yulyashka [42]3 years ago
7 0

Answer:The hypothesis that eukaryotic cells evolved from a symbiotic association of prokaryotes—endosymbiosis—is particularly well supported by studies of mitochondria and chloroplasts, which are thought to have evolved from bacteria living in large cells.

Explanation:

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Which of the following sequences shows a frameshift mutation compared to the wild-type mRNA sequence?
Butoxors [25]

Option C:

B. wild-type 5-AUGCAUACAUUGGAGUGA-3 mutant 5'-AUGCAUACAUCUGGAGUGA- 3' 

Explanation:

A frameshift mutation is a genetic mutation such that the triplet nature of gene expression by codons, the insertion or deletion occurs in such as way that it alters the complete sequence of 3 codon sets and can change the reading frame, resulting in a completely different translation from the original.

As it is pertinent to understanding that all genes are normally translated in sets of 3 codons, which typically describes and explain a unique amino acid sequence. Thus, if a frame shift mutation occurs, it can affect many amino acid sequences and finally the entire protein.  

If we look at option B:

wild-type 5-AUG   CAU  ACA  UUG  GAG  UGA-3  

mutant 5’-    AUG   CAU  ACA  UCU  GGA  GUG  A-3’  

An insertion of a base Uracil showed at the end of 3rd codon which affected and altered the whole sequence of codon triplets. This changed all next codons and finally all next amino acids will be altered.

8 0
3 years ago
A neuromuscular junction is a junction between a_________ and a ___________. A neuromuscular junction is a junction between a___
garri49 [273]

Answer:

myofibril bulbous end of axon and skeletal muscles fibres.

Explanation:o

It represents the  chemical synapse  of the axon bulbous ends  of the motor neuron ( motor end plate) and the skeletal Muscle fibres.

The influx of calcium ions into the bulbous ends leads to the fusion  and empty of the vesicles containing neurotransmitters into the synaptic cleft.

The Neurotransmitters binds to the receptors on the muscles membrane to allow the transmission of action potential ( PSIP or  PSEP)across the synaptic gap  to the muscles fibers  to initiate  their  contraction or relaxation.

5 0
3 years ago
Match the names and descriptions to the correct phase of a star's life cycle.
OleMash [197]

Answer:

pic 1 red giant, a star whose outer shell has expanded and cooled

pic 2: supernova, a shock wave produced by extremely high temperatures

pic 3: black hole, a high mass star that has collapsed from gravity

pic 4: white dwarf, a low mass star that has shed its outer layers

Explanation:

8 0
3 years ago
Need help on 12-19 <br> if u don't know don't answer
Bogdan [553]

Answer:

sup bus down totoan  or nle top shootasup bus down totoan  or nle top shootasup bus down totoan  or nle top shoota

Explanation:

4 0
2 years ago
Which traits are characteristic of multicellular organisms?
Nookie1986 [14]
The answer is A and B.
Hope that helped you.
4 0
3 years ago
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