Genetic variations are the raw materials of evolution. These variations will not be acted upon by natural selection unless they

Biology

1 answer:

enyata [817]3 years ago

7 0

Are in the phenotype of the organism

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Which statement correctly compares protists to prokaryotes?

4vir4ik [10]

<u>Answer:</u>

The correct answer is D

<u>Explanation:</u>

1- Most of the protists and all Prokaryotes are unicellular organisms.

2- Prokaryotes lack a proper nucleus and other membrane-bounded organelles while protists have membrane-bounded nuclei and other organelles.

3- Protists have cytosol where most of the organelles are found.

4- Protists don't have a cell wall while prokaryotes have a cell wall that acts as an extra protection layer. The cell wall of the protists shapes their body.

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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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What are the products of photosynthesis? (5 Points glucose and oxygen glucose and carbon dioxide carbon dioxide and ATP

vladimir1956 [14]

Answer:

Glucose and Oxygen

Explanation:

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Original DNA sequence: T A C G C G T G C A C G A T G C A G T A G T A C mRNA sequence:

Black_prince [1.1K]

Answer:A U G C G C A C G U G C U A C G U C A U C A U G

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Which drug can cause weight gain, acne, high blood pressure, and liver and kidney tumors?

andrew11 [14]

Alcohol and marijuana

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