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Alina [70]
3 years ago
7

Alveoli are sac-like structures that serve as the site of gas exchange. a. True b. False

Biology
1 answer:
RUDIKE [14]3 years ago
8 0

Answer:

True.

Explanation:

Alveoli are the microscopic structure present deep inside the lungs. Alveoli acts as a basic unit of ventilation. Alveoli are present in the lungs of mammals only.

Alveoli are hollow sac like structures when viewed under the microscope. Alveoli are the main site of the gas exchanges in the mammals. The alveoli are covered by the epithelial layers.

Thus, the correct answer is option (a).

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What information can you learn from electrophoresis
nadezda [96]

Answer:

DNA Sequencing.

Explanation:

In field of Biotechnology, we use an instrument known as "Gel Electrophoresis" in this instrument, different sized DNA Fragments are placed. After that, Electricity is applied due to which Negatively charged DNA fragments move towards positive charge through Gel Medium. Small sized DNA Fragments reach destiny before large fragments.

This is an application of Electrophoresis.

8 0
2 years ago
Screenshot below 20 points
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:

  1. Learn more about mitosis  <u>brainly.com/question/6462270 </u>
  2. Learn more about the menstrual cycle  <u>brainly.com/question/723944 </u>
  3. Learn more about meiosis <u>brainly.com/question/94813 </u>

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
An experiment that
gayaneshka [121]

Answer:

fails to verify

Explanation:

An experiment that <u>fails to verify</u> a hypothesis will often provide a new direction for the researcher.

Researchers conduct experiments to develop hypotheses. A hypothesis is a testable and falsifiable explanation. A hypothesis can be tested. It is possible to prove the hypothesis as true or false.

An experiment is a way to test the hypothesis.

4 0
3 years ago
An organism's _______ describes its genetic composition. An organism's _______ describes its appearance or observable characteri
belka [17]

Answer:

Chem formation, DNA

Explanation:

This is because of how an organism is made up/gets its genes.

4 0
2 years ago
Cells spend most of their time in..... a. interphase b. mitosis c. cytokinesis b. both mitosis and cytokinesis
Strike441 [17]

Answer:

interphase..............

3 0
3 years ago
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