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Lena [83]
3 years ago
12

Which of the following indicates that only a physical change has taken place?

Biology
1 answer:
siniylev [52]3 years ago
8 0
A change in the color of a substance -- this one is indeed a chemical change. Think of iron, if iron turns reddish, it's a completely different substance.
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____________________ can replace a gene in an animal’s genome. a. Recombinant DNA c. A genetic marker b. Messenger RNA d. A plas
Otrada [13]

Answer:

Recombinant DNA can replace a gene in an animal’s genome.

Explanation:

The molecular cloning process involves in creating Recombinant DNA. This DNA is used to replace or replicate any specific gene. This is done by the process of PCR to replicate it directly.

This formation is done in the presence of a vector. This method is used in the field of veterinary office, pharmacy and many more.  It has the ability to replace the gene of an animal’s genome.

7 0
3 years ago
I need help ...please seriously
yarga [219]

Answer:

I think the answer is B

Explanation:

5 0
3 years ago
Oxidative damage to DNA can often result in the alteration of a single nucleotide.
Harman [31]

Answer:

Repair mechanism for base cleavage (BER)

Explanation:

Repair by base cleavage (BER)

The altered bases are specifically recognized by glycosylases and removed, generating an AP site. The hole is filled by a DNA polymerase that takes the healthy strand as a template. This system arises not only by exposure to external agents, but also by the cell's own activity.

In case of damage in more than one nucleotide, repair by nucleotide excision (NER) is performed.

Nucleotide excision repair (NER)

The damaged area is recognized by UvrA and B, then A and B separate and UvrC enters which forms a complex with endonuclease activity with B. This enzyme cuts the T-dimer and the gap is filled by a DNA polymerase. There is also the TC-NER system (transcription-coupled nucleotide repair system). The alteration of these mechanisms gives rise to diseases such as: Xeroderma pigmentosum, Trichotiodystrophy or Cockayne Syndrome

5 0
3 years ago
Read 2 more answers
PLEASE HELP THIS ASSIGNMENT IS DUE IN 15 MINUTES!!!!!!!!!​
insens350 [35]

Answer:

First, the last picture

second, the third picture

third, the second or first (the picture is blurr so i dunno)

then the last is, the fourth.

sorry if wrong.

7 0
3 years ago
A hormone involved in the removal of excess glucose from the blood is:
irakobra [83]

Answer:

glucagon

Explanation:

Glucagon is a hormone that is involved in controlling blood sugar (glucose) levels. It is produced by the alpha cells, found in the islets of Langerhans, in the pancreas, from where it is released into the bloodstream.

7 0
3 years ago
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