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masha68 [24]
3 years ago
9

Which example illustrates Darwin's main contribution to the theory of evolution? A. An agricultural pest has been exposed to a p

esticide that wipes out the entire species. B. In a laboratory, a scientist chooses the most intelligent mice and breeds them to advance the species. C. When exposed to antibiotics, most bacteria in a population die but some survive and live to reproduce. D. In the African savannah, a scientist observes that a wildebeest calf has inherited its coat pattern from its father.
Biology
1 answer:
Andru [333]3 years ago
3 0
C. When exposed to antibiotics, most bacteria in a population die but some survive and live to reproduce.
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The chemoreceptors in blood vessels that sense oxygen and carbon dioxide levels in the blood are?
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Answer:

There are two kinds of respiratory chemoreceptors: arterial chemoreceptors, which monitor and respond to changes in the partial pressure of oxygen and carbon dioxide in the arterial blood, and central chemoreceptors in the brain, which respond to changes in the partial pressure of carbon dioxide in their immediate ...

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2 years ago
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Slav-nsk [51]

The two main stages involved in protein synthesis that is in central dogma theory are transcription and translation. The process of transcription and translation occurs in the nucleus and ribosome respectively. In the translation process, DNA is used as a template and mRNA is synthesized. In translation, a protein is synthesized by translating the codon.

Further Explanation:

The double-helical structure of DNA is duplicated through a process called DNA replication. Then, the DNA undergoes a process of transcription and form RNA. After this, RNA processing starts with post-translation modification and forms three different types of RNA molecules that are rRNA, tRNA, and mRNA. Transcription mainly occurs in the nucleus of the cell. In this stage, DNA acts as a template and synthesized new mRNA. Then, the formation of protein occurs. After the process of transcription, mRNA goes into the ribosome to synthesize new protein. In TRANSLATION processes, mRNA is converted to protein. Transfer ribonucleic acid is a kind of RNA that helps in decoding a messenger RNA sequence into a specific protein.

In TRANSLATION processes, mRNA is converted to protein, but to translate mRNA, it goes under many processing before into protein mainly in eukaryotes.

  • 5’Capping: In capping 7, ’methylguanosine is added to the 5’end of the transcription result by joining 5’to 5’phosphate.Capping is done only to protect the nascent mRNA from degradation and help in initiating translation.
  • 3’poly A tail: Around 100-250 residue of adenine nucleotide added to the 3’end of mRNA to maintain the stability of mRNA. Firstly, the 3’end of mRNA is cleaved and makes free 3’OH. Poly-A tail help in transporting the mRNA from the nucleus to cytoplasm for the translation process.

Learn more:

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Answer Details:

Grade: High School

Subject: Molecular Biology

Chapter: Gene expression

Keywords:

DNA, RNA, replication, double helical, nucleotides, transcription, proteins, translation, mRNA, rRNA, tRNA, RNA, converted, messenger, ribosome, nucleus.

8 0
3 years ago
The presence of variation in the size and shape of bacterial cells of the same species is known as _______.
Leno4ka [110]

Answer:

Correct answer is a pleomorphism

Explanation:

Some bacteria have the ability to change their shape and size which is called pleomorphism. The bacteria which change their shape and size are called pleomorphic bacteria.  

These bacteria change their shape due to the change in the external environment condition. For example, bacteria can from rod to coccus shape as their environmental condition changes.  

Some examples of pleomorphic bacteria are mycoplasma, some members of the Deinococcaceae family, helicobacter pylori, etc. So the correct answer is a.

6 0
3 years ago
Question 1: When a chemical reaction occurs, what happens to the atoms of the two substances?
MatroZZZ [7]

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products.

Explanation: No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

6 0
3 years ago
What does the lack of nourishment for the surviving plant in a raisin in the sun most likely reflect?
kenny6666 [7]
The options to this question are:

A. The strength of Mama's children
B. The hope in Walter's dream
C. The sour feelings among the characters
D. The need to embrace

The best answer is: 
the lack of nourishment for the surviving plant in a raisin in the sun most likely reflects  "The strength of Mama's children".

<span>A plant in a raisin basically represents a mama's dream that there will a day when she will have her own house with a small garden in the backyard.</span>

5 0
3 years ago
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