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Sedaia [141]
3 years ago
6

A tree of life depicting the hypothetical phylogeny of the three domains is shown above. A star is placed at the common ancestor

of all eukaryotes. Which characteristic would a common ancestor located at the star contain?
(See picture)

CHOICES: A- linear chromosomes with introns
B- circular chromosomes with introns
C- linear chromosomes lacking introns
D- circular chromosomes lacking introns

Biology
2 answers:
LenKa [72]3 years ago
6 0

Answer: A

Explanation: linear chromosomes with introns

love history [14]3 years ago
3 0
Answer: C. Linear chromosomes lacking introns

Explanation: Eukaryotes have linear chromosomes. After cellular replication, introns are spliced in eukaryotes and only keep the exons. This process also includes a 5’ cap and a poly-A tail.
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Mrna,amino acids,type of mutation
Leya [2.2K]

Answer:

mRNA: 3' AUG-AAU-GCU-GCC-GGU-GA-5'

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type of mutation: deletion, missense

Explanation:

The mRNA sequence is complementary to the DNA sequence. A always pairs with T, C always pairs with G. Except this is an RNA sequence not a DNA sequence, so T is replaced with U.

The mRNA sequence is translated into an amino acid sequence based on the triplet code. The triplet code for this sequence is shown in the attached picture. Each triplet signifies a specific amino acid. The codon can be identified from the table and placed in sequence. We can see that the new DNA strand has caused a new amino acid sequence. It has also left us with an incomplete sequence, as GA cannot signify an amino acid.

The type of mutation is a single base deletion. We can see that the base C is missing from the 9th amino acid in the original strand. As you can see, this has an ongoing affect on all the bases in the rest of the sequence, as it changes the way the sequence is organised into codons. This results in a missense mutation.

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3 years ago
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Free_Kalibri [48]

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-You'll never learn if u don't try ;)
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