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kherson [118]
3 years ago
9

Look at Figure 19–7 p.544. Which of the following explains why the edges of Africa and South America fit together like two piece

s of a puzzle?
Biology
1 answer:
Ymorist [56]3 years ago
4 0
This question is incomplete. However, the answer to this question is Continental Drift. Approximately 300 million years ago, there were not separate continents, only one giant super continent that we call Pangaea. Over time, scientists realised that the Earth's outer shell slides over the inner mantle through plate tectonics. Around 200 million years ago, Pangaea began to break up through the process of continental drift. Gondwana, incorporating present-day <span>Africa, South America, Antarctica, India and Australia, split from Laurasia (Eurasia and North America). Approximately 150 million years ago, Gondwana started to break up into the present day continents</span>
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4. A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly In the mutant below, indicate the type of mu
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Answer:

4. c. Deletion/ frameshift mutation

5. a. Tyr Tyr Asp Ser Gly

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Explanation:

4)

A single base pair at the first position of the Arg codon i.e. CGA has been deleted. Due to the deletion, the reading frame has shifted one nucleotide backwards, altering the amino acid sequence of the protein.

5)

The genomic DNA sequence is 5'-ATG ATA CTA AGG CCC-3'. Therefore, the complementary mRNA will be 5'-UAC UAU GAU UCC GGG-3'. According to the genetic code, this mRNA sequence encodes the following amino acid sequence: Tyr Tyr Asp Ser Gly

6)

The wild type DNA sequence is:

5'-ACUGUAAUGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'

The mutant i.e. mRNA with the added G will be

5' ACUGUAAUGGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'  

This is a single base pair insertion and frameshift mutation that shifts the reading frame one base pair forwards. The codon that was originally GAG coding for glutamic acid (Glu) gets converted to GGA that codes for glycine. Therefore, the amino acid sequence has been altered but the polypeptide chain will still have 13 amino acids.

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3 years ago
while observing an elodea plant cell through a microscope a student noticed a small moving greendisk these organelles are most l
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Explanation:

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