1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
RideAnS [48]
3 years ago
10

E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA

replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?
A) one high-density and one low-density band

B) one intermediate-density band

C) one high-density and one intermediate-density band

D) one low-density and one intermediate-density band

E) one low-density band
Biology
1 answer:
Katyanochek1 [597]3 years ago
8 0

Your answer would be D.


Hope this helps.

You might be interested in
What is waters role In forming fossil
Elodia [21]

Answer:

After an organism's soft tissues decay in sediment, the hard parts — particularly the bones — are left behind. Water seeps into the remains, and minerals dissolved in the water seep into the spaces within the remains, where they form crystals. ... If that mold gets filled with other minerals, it becomes a cast.

Explanation:

6 0
3 years ago
Read 2 more answers
Hey guys, can you please help someone out.
harkovskaia [24]

the human body is always at work and using all organs the bodys largest organ is the skin

6 0
3 years ago
4. Which of the following elements does not want to have eight valence electrons? a. magnesium c. hydrogen b. oxygen d. nitrogen
Cloud [144]

Answer:

Hydrogen.

Explanation:

Hydrogen is the simplest chemical element that exists. The symbol for the chemical element Hydrogen is "H" and it is a colourless, tasteless, odorless, and highly flammable gas.

Hydrogen is a chemical element found in group (1) of the periodic table and as such it has one (1) electrons in its outermost shell. Therefore, Hydrogen has an atomic number of one (1) and a single valence electrons because it has only one proton and one electron in its nucleus.

Based on the octet rule which states that atoms of chemical elements gain, lose or share electrons so as to have eight (8) electrons in their valence shell. Therefore, atoms of chemical elements bond in order to attain the electronic configuration of a noble gas i.e a full valence shell which comprises of eight (8) electrons.

However, the chemical element "Hydrogen" is an exception to the octet rule because it is only able to hold a maximum of two (2) valence electrons in its outermost shell to become full.

<em>Hence, Hydrogen is an element which does not want to have eight valence electrons. </em>

7 0
3 years ago
In a lake with three trophic levels (non-native fish, zooplankton, algae), an algal bloom occurs when the small population of zo
aev [14]

Answer:

The small population of zooplankton have an unequal effect on the marine community.

Explanation:

According to this question, there are three trophic levels of organism in a lake as follows: non-native fish, zooplankton, and algae. However, due to the declination in the number of zooplanktons in the lake as they were fed on by the non-native fish, the algal population increased to form a BLOOM.

This bloom of algal species can be attributed to the lack of zooplanktons, which represented the only herbivorous (plant eaters) organism in that community. Hence, their relatively small population have an unequal effect on the marine community. This means that the small population of zooplanktons caused an imbalance in the community and this is why ZOOPLANKTON is the keystone species in this scenario.

8 0
3 years ago
Local and global winds are set in motion by air moving in convection cells. Describe the motion of air in a convection cell. Be
IrinaVladis [17]

Answer:

Due to the earth spherical shape, different latitudes of the planet receive varying solar energy levels from the sun. This is due to the differences in how the sun rays hit the earth surfaces and differences in the length of atmosphere the rays have to travel before they reach the earth's surface.

The equatorial regions get the most energy levels from the sun hence their atmosphere gets heated faster and the hottest. The air mass in this latitude, therefore, gets less fast dense  and begins to rise. The cooler and denser air mass from the poles rushes in, through the  lower atmosphere, to replace the void of the rising air.

When this air mass also gets heated, it too begins to rise. Remember the initial air mass cooled as it rose into the upper atmosphere. This now makes it denser than the air mas below it. As the hotter air mass begins to rise from below it pushes the cooler air mass above laterally. After the lateral movement, the air mass begins to sink slowly as it moves towards the poles because the incoming air mass gets denser than the local air mass.

The lateral movement of the convection current moving to the north is deflected to the north-west due to the Coriolis effect of the earth rotation while the lateral movement of the convection current moving south is deflected to the south-west. These pockets of convection currents are called Hadley cells.

Learn More:

brainly.com/question/2160034

#LearnWithBrainly

8 0
3 years ago
Other questions:
  • A group of organisms which live together in an area is called a(n) ____.
    15·2 answers
  • What would happen if the sand dunes in an area were destroyed?
    7·2 answers
  • Nilai suhu reamur ke fahrenheit
    9·1 answer
  • Cholesterol belongs to the group of lipids called _____.
    15·2 answers
  • Which choice best summarizes the outcome of Reid’s experiment
    15·1 answer
  • If the cambium of a particular plant was damaged, what would be the most likely effect on the plant?
    11·1 answer
  • Question: 2 of 20
    14·2 answers
  • In some cases, recombinant DNA must be cloned before it can be inserted into a host. Which vectors can be used to clone recombin
    15·2 answers
  • Upon completion of seeding a flower and a vegetable, research and identify the optimum propagation conditions, such as, water an
    5·1 answer
  • A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the labor
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!