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Murljashka [212]
3 years ago
6

Changes in the DNA sequence or mutations help drive

Biology
1 answer:
BlackZzzverrR [31]3 years ago
8 0
The natural changes in DNA sequence or mutations help drive natural selection. Beneficial mutations will proceed and be passed along as generations progress, due to increased ability to survive to the changing living conditions an organism is exposed to. The contrary would be the case in the event that a non-beneficial mutation occurs.
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DNA content in a cell is measured in picograms (pg) (what ever that is) . A sea star has 17/20 pg of DNA a scallop cell has 19/2
Kobotan [32]
This is not Biology, it's math. You have too do what you did on the other problems which is convert them all too decimals using a calculator. Make sure too write them down and them just find which number is more or less.


7 0
3 years ago
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How does energy flow in a food chain or web? What happens as it moves up in trophic levels
dmitriy555 [2]

As energy moves through trophic levels in an ecosystem the amount that is available decreases. ... A: Energy flows in a food web by being transferred to and between organisms as they undergo photosynthesis, are consumed by another organism, or decompose.

7 0
3 years ago
Classify each description as true of introns only, exons only, or both.A-present in eukaryotic genomesB-generally absent from ba
maxonik [38]

The right answers are:

A-present in eukaryotic genomes ==> Both exons and introns

B-generally absent from bacterial genomes ==> Introns

C-part of the final mRNA strand ==> Exons

D-code for an amino acid sequence ==> Exons

E-removed from initial mRNA strand prior to translation ==> Introns

F-present in the DNA used as the template for transcription ==> Both exons and introns

In the genes of eukaryotic organisms, the exons are the segments of an RNA precursor that are conserved in the RNA after splicing and that are found in mature RNA in the cytoplasm. The segments of the RNA precursor that are removed during splicing are called in opposition to introns. Exons are mainly found in messenger RNAs (mRNAs) encoding proteins. Some mRNAs may sometimes undergo an alternative splicing process in which one or more exons may be excised or some introns preserved in rare cases.

6 0
3 years ago
Would chromosome number have an effect on natural selection in a subspecies of giraffes?
dmitriy555 [2]

Answer:

Yes

Explanation:

3 0
3 years ago
Describe the main characteristics of chordates.<br> Please DESCRIBE! <br> thanks
egoroff_w [7]

Answer:

The characteristic features of the phylum Chordata are a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a tailgut.

Hope this helps

7 0
3 years ago
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