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vichka [17]
2 years ago
12

It is always important to consider safety as you are conducting a science investigation. What are three common safety precaution

s you should use during an investigation?
Biology
1 answer:
Elina [12.6K]2 years ago
3 0
You should wear safety goggles, make sure that your equipment is clean, and use the proper amount of chemicals(or other substance) as told
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How can a molecule that contains an atom of phosphorus be made radioactive using an unstable isotope?
AVprozaik [17]

Answer:

A radioactive (unstable) phosphorus isotope is made to replace a nonradioactive isotope of phosphorus in the molecule

Explanation:

Phosphorus has both unstable (radioactive) and stable isotopes. In any compound that contains phosphorus, the phosphorus atom present may be either a stable isotope of phosphorus or an unstable isotope of phosphorus.

However, if the molecule contains a stable nonradioactive isotope of phosphorus, it is possible to convert this isotope in the molecule to the unstable radioactive isotope by carefully carrying out exchange reactions in which the phosphorus isotope replaces the nonradioactive isotope in the molecule.

This is usually done in order to create radioactive tracers which are used to study chemical reactions and biochemical processes.

3 0
2 years ago
One of the questions early geneticists had to answer was how only four nucleotides can specify placement of 20 amino acids in pr
jenyasd209 [6]

Answer:

<h2>Codon </h2>

Explanation:

The sequence of DNA is transcribed into mRNA, containing the sequence  for protein synthesis, protein is synthesized according to the codons in mRNA.  This sequence of nucleotide on DNA/ RNA is divided into a series of three nucleotide units, and one unit of three nucleotide is  known as codons.

There are overall 64 codons, 61 codons out of 64 codons, codes for overall 20  amino acids, and the remaining three  are stop codons.

These there codon do not code for any amino acid.

And these 61 codons, they  code for total 20 amino acids. So one amino acid can be coded by one or more than one codons.

6 0
3 years ago
The substance dichlorophenyldimethylurea (DCMUDCMU) is an herbicide that inhibits photosynthesis by blocking electron transfer b
mario62 [17]

Answer:

No

Explanation:

During cyclic photophosphorylation, electrons are cycled continuously out of and back into the reaction center of PSI. It does not involve PSII and plastoquinone. During non cyclic photophosphorylation, the reaction center of plant photosystem II passes electrons to plastoquinone. The reduced plastoquinone carries electrons to the cytochrome b6f complex. Since PSII and plastoquinones are not included in cyclic photophosphorylation, dichlorophenyldimethylurea would not affect the process.  

5 0
3 years ago
Why do mangroove tree survive in the water?
alexandr1967 [171]
<span>Mangroves store water in their leaves. some also grow pencil-like roots that stick up out of the dense, wet ground like snorkels. These breathing tubes are called pneumatophores, allowing the mangroves to cope with flooding/ survive in water

</span>
6 0
3 years ago
Karen knows that trees use energy from the sun to make food. she wants to plant several trees in her backyard, but she is worrie
melisa1 [442]

Karen is NOT correct. This is because the sun's energy is a renewable resource. This means that its  use is sustainable hence it is a substance of economic value that can be replaced or replenished in the same or less amount of time as it takes to draw the supply down. Though the sun is a finite resource,  it cannot be depleted within human timescale.






7 0
3 years ago
Read 2 more answers
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