With respect to energy, Earth is a........

Biology

1 answer:

olga2289 [7]2 years ago

5 0

Closed system because I used safari for 5 minutes!

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What monomers are found in dna and rna

olganol [36]

Got this from Google hope this helps

The monomers of DNA and RNA are nucleotides, which are made up of a phosphate group, a five-carbon sugar and a nitrogenous base. In DNA, the nitrogenous basesare adenine, cytosine, guanine and thymine. In RNA, the nitrogenous bases areadenine, guanine, cytosine and uracil.

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3 years ago

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When crossing over take places chromsomes

laila [671]

Answer: D

Explanation:

Crossing over refers to homologous chrosmomes exchanging DNA which creates variation of chromsoomes that are inheried by offspring.

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2 years ago

Organisms that obtain energy by eating nutrients that make up other organisms are called:

balu736 [363]

The organisms that obtain energy by eating nutrients that make up other organisms are called Hetertrophs. The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query about and it will be able to help you, and if you’d like, feel free to ask another question.

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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 instrument would scientist use to take measurements in the upper troposphere

nirvana33 [79]

A scientist would use, C. Weather Balloon.

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