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photoshop1234 [79]
3 years ago
8

Sediment deposited where a river flows into an ocean or lake

Biology
1 answer:
dusya [7]3 years ago
8 0

Answer: food plain

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.
8 0
3 years ago
Why might a phylogeny based only on molecular data show a different pattern of relationships than a phylogeny of the same taxa b
Kitty [74]

A phylogeny of the same taxa based only on morphological traits:

Some highly conserved genetic sequences can result in unrelated species appearing closely related in a molecular phylogeny, and not reflect the same pattern as the morphologic phylogeny.

Gene sequence changes may not result in morphological changes.

Gene sequences always provide more data than morphological traits.

Morphological analyses always provide more data because each morphological trait is the result of the expression of many genes.

The molecular data may be based on the analysis of introns, which aren't expressed and don't contribute to the evolutionary history of a group of taxa.

Why is molecular data more accurate?

Phylogenetic trees reconstructed from molecular sequences are often considered more reliable than those reconstructed from morphological characters, in part because convergent evolution, which confounds phylogenetic reconstruction, is believed to be rarer for molecular sequences than for morphologies

Learn more about molecular data :

brainly.com/question/16044878

#SPJ4

6 0
1 year ago
What is unique about the members of the group of fungi to which Penicillium notatum belongs? They are not important for medicine
fgiga [73]

Answer:

The correct answer is - they are not made-up of hyphae.

Explanation:

Penicillin notatum is a member of fungi and penicillin genus. These fungi are present on salted foods, inside the house in damp parts mostly.

These fungi are not made up of hyphae. Hyphae are filamentous branches that form fungi body in other fungi groups. On this genus its more of like bush or brush.

Thus, the correct answer is option - they are not made up of hyphae.

4 0
3 years ago
Read 2 more answers
What would happen to the mountain lion population if the deer became extinct?
Fofino [41]
The mountain lion population will decrease.
7 0
3 years ago
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Is dog breeding an art???
Law Incorporation [45]

Answer:Just because two dogs complement each other in physical appearance does not mean they will complement each other when comparing pedigrees. As spoken so well by my mentor, breeding is an art. When doing a breeding, stick to the breed standard, and strive for perfection

Explanation:

3 0
3 years ago
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