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Gwar [14]
3 years ago
8

what is the length of time called that an organism is expected to live? a. life span            b. homeostasis c. stimulus      

       d. theory
Biology
1 answer:
IrinaK [193]3 years ago
7 0
The question is asking to choose among the following choices that states the length of time that an organism expected to live, and base on my research and further investigation, I would say that the answer would be A. life span. I hope you are satisfied with my answer and feel free to ask for more 
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HELLPPP 15 POINTS!!! Why are bacteria becoming more resistant to antibiotics? a bacteria are changing and evolving b antibiotics
shusha [124]

i think the most logical is A

because antibiotic resistant occurs when bacteria change in some way that reduces or eliminates the effectiveness of drugs, chemicals, etc

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Like all enzymes, restriction endonucleases (REs) need to be handled very carefully to ensure that they do not denature. Which o
andriy [413]

Answer:

The correct answer is:  d. REs activity is best preserved by freezing the RE and thawing it out for brief periods of time as needed.

Explanation:

  • Restriction enzymes can be defined as endonucleases that can recognize specific nucleotide sequence in a DNA (Deoxyribonucleic acid) sequence and cause breakage of phosphodiester bond in the DNA at the target site. Hence, it has the capacity of cleaving a DNA sequence.
  • These are made up of proteins which are required to be present in the accurately folded conformation in order to function.
  • Any form of alteration in the three-dimensional structure of the protein induced due to physical, chemical, mechanical or physiological factors can cause denaturation of the protein which in turn can render the protein non-functional.
  • Freezing of restriction enzymes (REs) directly without the use of glycerol will cause the movement of water molecules within the proteins as well layering of water molecules on the protein surface.
  • At low temperature these water molecules change to ice crystals which can alter the conformation of the protein or can cause breakage of peptide bonds in the proteins by physical force.
  • This can cause the protein to get denatured and hence non-functional.
  • Hence, it is never advisable to preserve REs by freezing directly without glycerol.
  • Glycerol forms a layer around the protein molecules and prevents the protein molecules from coming into direct contact with the water molecules and hence prevents protein denaturation.
7 0
3 years ago
4. What happens to animals that do not eat food (glucose)? Explain in detail what is<br> happening.
DedPeter [7]

Answer:

they die

Explanation:

they die

7 0
3 years ago
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Explanation:

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3 years ago
Researchers discover that a north american bird species called a brown thrasher has a very similar beak structure to one of darw
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The answer would be analogous and convergent evolution. In evolutionary biology, convergent evolution is the procedure whereby creatures not carefully related, self-sufficiently evolve alike traits as an outcome of taking to familiarize to like surroundings. The beaks can be described as analogous since there is a similarity of structures that came from different origins.
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