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Katen [24]
2 years ago
10

The homo erectus fossils from the lantian sites in china are dated to______ years old.

Biology
1 answer:
REY [17]2 years ago
6 0

Answer: 1.15 million

Explanation:

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Certain amino acids are called essential because they ______.
kumpel [21]
Essential amino acids are amino acids that must be supplied to one's body by their diet because they cannot be synthesized from scratch. 
3 0
4 years ago
Put the following steps in the correct order from 1-9
storchak [24]

Answer:

transcription of mRNA from DNA

small ribosomal subunit binds to mRNA

initiation complex formed with addition of large ribosomal subunit

translocation

codon recognition (non-initiating site)  

peptide bond formation

ribosome reads a stop codon

polypeptide chain is released from the P site

ribosomal subunits dissociate

Explanation:

The above describes the process of translation in the ribosome. After transcription of DNA to mRNA, the mRNA is taken to the ribosome to undergo translation, here the mRNA binds to the small ribosomal subuits and to other initiation factors; binding at the mRNA binding site on the small ribosomal subunit then the Large ribosomal subunits joins in.

Translation begins (codon recognition; initiating site) at the initiation codon AUG on the mRNA with the tRNA bringing its amino acid (methionine in eukaryotes and formyl methionine in prokaryotes) forming complementary base pair between its anticodon and mRNA's AUG start codon. Then translocation occurs with the ribosome moving one codon over on the mRNA thus moving the start codon tRNA from the A site to the P site, then codon recognition occurs (non-initiating site again) which includes incoming tRNA with an anticodon that is complementary to the codon exposed in the A site binds to the mRNA.

Then peptide bond formation occurs between the amino acid carried by the tRNA in the p site and the A site. When the ribosome reads a stop codon, the process stops and the polypeptide chain produced is released and the ribosomal subunits dissociates.

6 0
3 years ago
How is coal formed and why is it considered a nonrenewable resource??
OverLord2011 [107]
Coal is considered a non renewable source because the earth cannot replenish it.
5 0
3 years ago
Read 2 more answers
Anybody know how to do this?​
liq [111]

Answer:

Sorry

Explanation:

Sorry I don’t understand to so I can’t help you

4 0
3 years ago
Which of the following correctly describes Prophase?
ivann1987 [24]

Answer:

A

Explanation:

I believe its a because the nuclear envelope dissolves is one of the first things that happen and chromosomes form.

5 0
3 years ago
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