What is a control group?

Biology

2 answers:

Marina CMI [18]2 years ago

6 0

Answer:

B. An experiment that you don't change any variables.

MrRa [10]2 years ago

5 0

Answer:

B. An experiment that you don't change any variables.

Explanation:

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

cricket20 [7]

Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.

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3 years ago

What happens to a sedimentary rock after tectonic plates push upwards? What would it turn into?

tester [92]

Hi, sounds like it would turn into B). Metamorphic Rock. Igneous rocks are only formed when melted rock hardens and solidifies. Sediimentary rock is formed when sediment is deposited out of air, ice, wind, gravity or even water. I Doubt it would remain a sedimentary rock so the best answer would be metamorphic rock. Hope this was correct. :)

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3 years ago

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Help me to answer this

lidiya [134]

Answer:

Explanation:

No I don't think so because there are animals who live there and he shouldn't destroy their habitat

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2 years ago

Anthropology seeks the broadest possible understanding of humankind. it does this through its

Zepler [3.9K]

<span>Is the study of humankind in all times and places.
-the study of all humans throughout time and space. Hope it helped!</span>

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3 years ago

When did Isaac Newton start learning facts about Force and Motion?

Blababa [14]

Answer:

He developed the theories of gravitation in 1666, when he was only 23 years old. Some twenty years later, in 1686, he presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis." The laws are shown above, and the application of these laws to aerodynamics are given on separate slides.

Explanation:

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3 years ago