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Travka [436]
3 years ago
12

ALOT OF POINTS PLEASE HELP :) How did humankind discover the presence of DNA?

Biology
1 answer:
Marat540 [252]3 years ago
6 0

Answer:

The real breakthrough in understanding DNA, however, came with the discovery of its structure in 1953. The discovery of the structure of DNA is often credited to James Watson and Francis Crick.

Explanation:

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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
3 years ago
How many stages are in meiosis ii?
bekas [8.4K]
The end result is production of four haploid cells (n chromosomes, 23 in humans) from the two<span> haploid cells (with n chromosomes, each consisting of </span>two<span> sister chromatids) produced in </span>meiosis<span> I. The four main </span>steps of Meiosis II<span> are: Prophase </span>II<span>, Metaphase </span>II<span>, Anaphase </span>II<span>, and Telophase </span>II<span>.</span>
5 0
3 years ago
A true breeding line of green pod pea plants is crossed with a true-breeding line of yellow pod plants. All of their offspring h
andre [41]

Answer:

green is the dominant trait and yellow would only be found in the second generation when 2 passive yellow genes can come together a green or yellow or green w green trait will always be green a pea can only be yellow with 2 recessive yellow genes

Explanation:

7 0
3 years ago
Which is a characteristic of plants? They are unicellular. They are made up of prokaryotic cells. They have chloroplasts. They p
eimsori [14]
They have chloroplasts. They do not possess mobility because they cannot just stand up and walk to the nearest river. Unicellular organisms are very small, and most organisms are multi-cellular, including plants. Plants, animals, and fungi are eukaryotic, but only bacteria is prokaryotic. So therefore, choice 3 is correct.
7 0
3 years ago
Read 2 more answers
Define photosynthesis???​
stellarik [79]
Photosynthesis is a process which plants and organisms use sunlight to synthesize foods from carbon dioxide and water.
8 0
2 years ago
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