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2 years ago

14

Which derived character is shared by lizards and wolves but not frogs? A. jaw bones B. four-legged locomotion C. amniotic eggs D

. vertebral column

1 answer:

VMariaS [17]2 years ago

3 0

A. jaw bones

let me know if i was correct

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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

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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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26. Suppose the two guanosine (G) nucleotides in #3 above were changed to two cytosine (C) nucleotides. What is the new amino ac

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Answer:

This question is incomplete

Explanation:

This question is incomplete but the completed question can be found in the attachment below.

During protein synthesis, a sequence of three mRNA nucleotides (called codons) correspond to specific amino acids. From the question, the change in guanosine nucleotides will change the sequence as follow

DNA: T--A--C--A--A--C--T--A--C--T--T--C--T--T--T--C--T--T--A--A--A

mRNA: A--U--G|-U--U--G|-A--U--G|-A--A--G|-A--A--A|-G--A--A|-U--U--U

Amino Acids: met -- leu -- met -- lys -- lys -- Glu -- Phe

The new amino acid sequence is represented above from the new DNA sequence.

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The main protein in human cells is telomerase, which contains an RNA primer and is required to extend the synthesis of lagging strands in linear chromosomal telomeres.

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