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kykrilka [37]
3 years ago
13

You are studying an alien bacteria-like organism isolated from the clouds of Venus. You decide to repeat the Meselson-Stahl expe

riment to find out how it replicates its DNA. This time you plan to grow the cells on light 14N medium for many generations first. Then, you plan to transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the alien replicates its DNA via the conservative model of DNA replication, what is the expected distribution of DNA in the density gradient after two rounds of replication
Biology
1 answer:
fenix001 [56]3 years ago
5 0

Answer:

it is expected to observe two bands: one band of light density and one band of heavy density

Explanation:

DNA replication is semiconservative because when DNA is replicated both resulting DNA molecules are composed of one original strand and one newly synthesized strand. If DNA replication would be conservative, then the original DNA molecule would serve as a template to produce a new DNA molecule, thereby each cell division would produce one daughter cell with a new DNA molecule and one daughter cell with the original DNA molecule of the parental cell. In this case, the transfer of bacteria-like organisms into a heavy 15N medium would produce two types of DNA cells after replication: cells with original DNA of light density (14N) and cells with new DNA of heavy density (15N), which would be distributed in two bands after centrifugation.

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belka [17]

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Hopefully these are correct.

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4 0
4 years ago
Read 2 more answers
The diversity of species in a community refers to the _____. interactions of different species ability to resist change number o
Alla [95]

Answer:

number of different species

Explanation:

The diversity of a species is the number of different species in a given community (dataset).  Meanings of species diversity may include species richness, taxonomic or phylogenetic diversity, and/or species evenness.

4 0
3 years ago
A relationship between organisms in which one species benefits and the other is not affected is
Hitman42 [59]
The answer is D. Mutualism is the symbiotic relationship when both organisms benefit. Predation is not a symbiotic relationship. Parasitism is the symbiotic relationship where one organism benefits and the other is harmed.
5 0
3 years ago
Consider the following food chain:
AlladinOne [14]

Answer:

0.01%

Explanation:

If the grass is 100%, then the grasshopper is 10%, the mouse is 1%, the snake is 0.1%, and the hawk is 0.01%. When you go up the trophic levels, you only get 10% of the energy left behind from the last level (in other words, you move the decimal point to the left by 1 place).

6 0
4 years ago
Suppose a dominant allele (N) codes for a big nose and a recessive allele (n) codes for a small nose. Imagine that an organism r
Crank
From the information given, we can determine that the organism's genotype is:

Nn (heterozygous dominant, aka one dominant allele and one recessive one)

Phenotype refers to how the genotype manifests in the organism, and since a dominant allele overrides the recessive one, the phenotype must be 'Big Nose' for this organism.

6 0
4 years ago
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