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Simora [160]
3 years ago
8

What can a scientist do during an experiment so that others can repeat the experiment exactly the same way?

Biology
1 answer:
Zolol [24]3 years ago
6 0
The answer is
c. he should write down data clear, step-by-step instructions as he goes along
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Tissue culture experiments with PDGF demonstrate that without this substance _____.
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Answer:

Answer is 2. Fibroblasts fail to divide.

Explanation:

Tissue culture experiment is the experiment where tissues are grown in an artificial medium. This involves the use of growth medium such as agar or broth. This process help to produce needed tissues in a short period of time.

Fibroblasts are cells which are found in the collective tissues, and they produce collagen. The collagen produced by the Fibroblasts play important role in tissue repair. Fibroblasts are regarded as the main cells in the connective tissue.

Note that, PDGF, which is Platelet -derived growth factor in full, is a growth factor regulating cell growth and it's division.

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2 years ago
Which sentence correctly describes the relationship between DNA, genes, and chromosomes? A gene is a segment on the DNA. DNA is
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<h2>Answer:</h2>

The correct statement is option A which is, "A gene is a segment on the DNA. DNA is wrapped in proteins to form a chromosome".

<h3>Explanation:</h3>
  • A gene is the part of DNA in the nucleus which encodes for the specific trait in the body. DNA is the nucleotide sequence which is the blue print for the whole organism. It contains genes for all the structures and functions in the body.
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3 years ago
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You decide to create a composting bin for your house. While checking on it one day, you notice that the compost bin has started
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Turning the pile to aerate the compost and expose it to oxygen will help resolve the smell

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Food doesn't taste good during common cold. why?​
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The correct sequence of events occurring during transcription is
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Firstly, the enzyme, DNA Helicase breaks the Hydrogen bonds between a specific region of the DNA molecule and unwinds the duplex DNA molecule at the targeted gene sequence site.
 Then, RNA Polymerase binds at the 3` site of the gene sequence of the sense/coding strand(only one strand) that acts as the template for mRNA synthesis. RNA Polymerase then matches free nucleotides by complementary base-pairing(A-U & C=G), working in the 5`to3` direction. Hydrogen bonds then form between the complementary bases, holding the nucleotides in place. Each free adjacent nucleotide is joined at 3` ends by Condensation reactions with the other to form Phosphodiester bonds.
Once the mRNA molecule is formed, it is separated from the synthesis complex and leaves the nucleus through pores in the nuclear envelope to moves towards ribosomes for Translation.
Lastly, the DNA double helix rewinds by forming Hydrogen Bonds.

6 0
3 years ago
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