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Ilia_Sergeevich [38]
3 years ago
5

What are three ways to determine the age of earth specimens and help prove that the changes on the earth occur over very long pe

riods of time?
Biology
1 answer:
Verizon [17]3 years ago
4 0

Answer:

The decay of potassium to argon, uranium to lead, and one isotope of lead to another are some common yardsticks used to date very old rocks. These dating methods allow scientists to put real ages on rocks with astonishing accuracy.

Explanation:

The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years.

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What is the name for the measure of a drug's relative safety for use, computed by the ratio of the lethal dose for 50 percent of
ira [324]
It is called THERAPEUTIC INDEX. Therapeutic index is the comparison of the amount of a particular drug that causes the desired therapeutic effects and the amount that causes toxicity. The index can be low or high. A drug with a low therapeutic index will require only a small increase in dose to produce toxic effects in users. 
5 0
3 years ago
When utilizing a KO mouse model, you want to see if introducing the dystrophin gene can rescue the DMD mouse model. Propose a me
-BARSIC- [3]
<h2>CRISPR/Cas9</h2>

Explanation:

CRISPR can be used to reintroduce dystrophin back into the KO mouse

  • CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats and is used to for gene editing
  • CRISPR/Cas-mediated genome editing has been shown to permanently correct DMD mutations and restore dystrophin function in mouse models
  • Germline editing by injecting zygotes with CRISPR/Cas9 editing component was first done in mdx mice by correcting the mutated exon 23
  • Postnatal editing of mdx mice was then achieved using recombinant adeno-associated virus to deliver CRISPR/Cas9 genome editing components and correct the dystrophin gene by skipping or deleting the mutated exon 23 in vivo
  • Germline and postnatal CRISPR/Cas9 editing approaches both successfully restored dystrophin function in the mice and same technique can be used for KO mouse model
4 0
3 years ago
Researchers investigating the regulation of neurotransmitter release from presynaptic neurons proposed a model in which CDK5, a
GrogVix [38]

Answer:

"GFP contained in synaptic vesicles moved into the synaptic cleft by exocytosis."

Explanation:

Synaptic vesicles are small membrane sacs that carry neurotransmitters from the cell body where they are produced, to the presynaptic membrane of the terminal button where they are released. The release zone of the presynaptic membrane contains voltage-dependent calcium channels. When an action potential depolarizes the presynaptic plasma membrane, Ca^{2+}-channels open, and  Ca^{2+} flows into the nerve terminal to trigger the exocytosis of synaptic vesicles, thereby releasing their neurotransmitters into the synaptic cleft

3 0
2 years ago
What type of bond holds the nitrogen bases together across the DNA's two
stich3 [128]

Answer:

Hydrogen

Explanation:

2 between A-T and 3 between G-C

6 0
3 years ago
During which process is mRNA converted into a sequence of amino acids for protein production?
slava [35]

Answer:

Translation

Explanation:

When assembled in the nucleus, mRNA peels off and moves to the cytoplasm. Here, it attaches to a ribosome. As the mRNA  moves along the ribosome its information is translated into the appropriate amino acids which are assembled into a polypeptide.

4 0
3 years ago
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