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OverLord2011 [107]
3 years ago
12

Meselson and Stahl’s work on DNA replication takes an experimental approach, where some cells are grown in culture in the presen

ce of radioactive nucleotides for many generations so that both strands of every DNA molecule include radioactive nucleotides. The cells are then harvested and placed in new medium with nucleotides that are not radioactive so that newly synthesized DNA will not be radioactive. _______ (proportion) of DNA molecules (each molecule is double stranded not single stranded) will contain any radioactivity after two rounds of replication? This experiment also demonstrates that replication is__________________.
a. 1/8; semiconservative
b. 1/8; dispersive
c. 1/4; conservative
d. 1/2; conservative
e. 1/2; semiconservative
Biology
2 answers:
otez555 [7]3 years ago
7 0

Answer:

Option E 1/2 semiconservative

Explanation:

Typically, after the first round of replication, their experiments should yield 2 molecules of double stranded DNA, for one molecule of DNA that is double stranded; one parental radioactive strand and a new non-radioactive strand.

Then, after two rounds of replication, there should be  2 molecules of double stranded DNA with this characteristic and another two with a completely non-radioactive double stranded DNA.

Thus, 2/4=1/2 proportion of DNA molecule will not contain any radioactivity and this type of replication is semi conservative.

lina2011 [118]3 years ago
4 0

Answer:

e. 1/2; semiconservative

Explanation:

1/2 (proportion) of DNA molecules (each molecule is double stranded not single stranded) will contain any radioactivity after two rounds of replication.

This experiment also demonstrates that replication is semiconservative .

DNA replication is semi-conservative because each helix that is created contains, one strand from the helix from which it was copied.

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A blizzard can form when certain physical factors combine with the presence of moisture in the atmosphere. Which two factors com
SIZIF [17.4K]

Answer:

A blizzard can form when warm air combines with a high pressure system.

Explanation:

A high pressure zone is defined by cold air mass that has higher density than surrounding air mass. Therefore when a warm air current blows towards the high pressure system, the warm air mass rises over the cold air mass of the high pressure system.

The warm air begins to cool at the front between the  cold air mass and warm air mass. Usually for a blizzard to occur the cold air mass is usually below freezing point temperatures. Therefore the moisture in the warm air cools and freezes into snowflakes. This is why the winds of a blizzard are accompanied by snowflakes akin to a winter storm.

Lean More:

For more on blizzards check out;

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#LearnWithBrainly

3 0
4 years ago
The earth is nade up of 75%. Sources such as oceans have an important role in keeping Earth's surface insulated and warm. What p
maw [93]

Answer:

I'm more then sure it is A but let my know it im wrong if i am sorry :)

Explanation:

4 0
3 years ago
Can you tell the difference between the original and the replicated strand
kati45 [8]

Answer:

Original strand is the old strand and replicated strand is new strand.

Explanation:

DNA is replicated by the semi-conservative way which means the new strand is replicated over the old strand and one DNA duplex has one new strand and one old strand. So the original strand is the old strand and the replicated strand is the strand that is synthesized over the original strand.

In DNA the replicated strand is made by adding nucleotides complementary to the opposite nucleotide present in the template or original strand. Adenine and thymine make complementary base pairing with each other and guanine and cytosine makes complementary base pairing with each other.

6 0
3 years ago
How many steps are involved in mitosis? <br> a. 1 <br> b. 2 <br> c. 4 <br> d. 8
Umnica [9.8K]
Mitosis is a step...which
further contains 4 steps each..
so the answer should be 4 steps..

mark brainliest if it helps
4 0
4 years ago
In eukaryotic cells, DNA is packaged with proteins into structures called chromosomes. What advantage do chromosomes provide the
Vadim26 [7]

Answer:

Option C, They allow random distribution of genetic material when a cell divides.

Explanation:

The chromatin are responsible for packaging of DNA molecule into smaller space with in a chromosome. It not only package it but also protect it from. Packaging allows for easier division of cells during mitosis and meiosis and hence prevent any kind of damage to the DNA.  

Chromosomes make recombination and random segregation of genetic material to form new cells.  Each new cell gets equal number of chromosomes

Hence, option C is correction

4 0
4 years ago
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