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Alexandra [31]
3 years ago
8

Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for 1 generatio

n. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
Biology
1 answer:
ahrayia [7]3 years ago
4 0

Answer:

The intermediate density band is observed.

Explanation:

Messelson and Sthal's explained the model of  semi conservative nature of DNA replication. According to this model, the newly synthesized DNA molecule contains one newly synthesized strand and one parental strand.

Firstly, bacteria grown in 15N media is transferred to 14N media. The isolated DNA is centrifuged and intermediate density DNA  band is observed that contains one strand of 15N (parental strand) and one strand of 14N (newly synthesized strand).

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If an animal fossil was found in a rock, what would be the best way to determine its absolute age?
LiRa [457]

Answer:

D

Explanation:

Absolute age is defined as the numeric age of fossils.

To identify the absolute age of a fossil,  the amount of certain radioactive elements in the rock are measured. When fossils are formed in the rocks, a small amounts of radioactive elements is included in it. The process to identify age of fossil using radioactive elements is known radiometric dating. So, radioactive isotope and its decay product gives absolute age of fossils.

Hence, the correct answer is "D".

3 0
2 years ago
Arthropod exoskeletons and mollusc shells both ________.a.are secreted by the mantleb.help retain moisture in terrestrial habita
nasty-shy [4]

Answer:

b. help retain moisture in terrestrial habitats

Explanation:

Arthropods such as cockroach, centipedes, spiders, crab are the members of the largest phylum Arthropoda. These are animals with paired jointed legs and their body is covered with an exoskeleton made of chitin. They live in diversified habitat and exoskeleton helps to retain moisture in theterrestrial habitats.

Similarly mollusks such as sepia, snail are soft bodied animal whose body is covered with calcareous shell as a protection and to retain moisture while living on land.

8 0
3 years ago
Help plz :) <br> dyshujdheyudiokdmfj
Anna35 [415]

Answer: 30 years

Explanation: what is 30 plus 30... 60 it says he died in 1930 and discoverd the thing in 1960  add 30 boom its been 30 years

8 0
3 years ago
In ocean waves, water particles move ________ and energy moves ________. A) vertically; in circles B) in circles; horizontally C
son4ous [18]
In ocean waves, water particles move in circles and energy moves horizontally. Ocean waves are orbital progressive waves. The water molecules that make up the wave move in circles, or orbits, as the wave progresses. The ocean orbital waves get their start when wind blows on the open ocean, A gentle wind doesn't have much of an effect, but the stronger wind becomes the more it pushes against the water. It transfers energy to the water as it makes peaks and whitecaps in the water's surface.
7 0
3 years ago
Read 2 more answers
Clara is a vegan and she does not drink milk, a food advertised as a best source of calcium. But she is not worried too much sin
marysya [2.9K]

Explanation:

%DV label= 27%

1 cup of cooked collared greens= aprx 266.60 mg of Calcium

Assuming Clara is...

  • a teen, her required adequate intake (RAI)=  1300 mg/ day
  • an adult, her RAI= 1000 mg/day

For teenaged Clara

∵27 % DV= 270mg

% daily Calcium=  \frac{270}{1300}  * 100= = 20.8 ≈ 21%

=0.21

<u>21% of her daily calcium needs is in a cup of cooked collard greens.</u>

Calcium is an essential mineral required by the human body, it is involved in cell signalling, muscular function and homeostasis. Along with fats, fiber, vitamin A and C and iron, calcium makes up part of a recommended daily intake target or DV- these are integral to a balanced diet.

Learn more about energy storage at brainly.com/question/523624

Learn more about homeostasis at brainly.com/question/1601808

#LearnWithBrainly

3 0
3 years ago
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