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3 years ago

Which group of fish do scientists believe amphibians evolved from?

Biology

2 answers:

Gwar [14]3 years ago

8 0

Scientists believe that amphibians evolved from bony fish. C.

Makovka662 [10]3 years ago

8 0

Answer: The correct answer is -

C. bony fish.

The bony fish evolved into two distinct groups, which are Sarcopterygii that contains the lobe-finned fish and Actinopterygii that contains ray-finned fish

The lobe-finned fish further evolved and gave rise to the tetrapods (which are the vertebrates with four limbs), represented by amphibians, reptiles, birds, and mammals.

These lobe-finned fish evolved and developed multi-jointed leg, such as fins with digits, which helped them to crawl along the side of sea.

Thus, they resulted in the evolution of amphibians.

Therefore, option C) Bony fish is the right answer.

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Below is a mature eukaryotic mRNA transcript. Translate this mRNA into a protein, also showing the tRNA anticodons involved. Mak

diamong [38]

Answer:

mRNA ⇒ 5'GMU UAC AUG CGG CUC AGU UGA GGC GAA AAA A 3'

tRNA ⇒ UAC GCC GAG UCA ACU

protein ⇒ N - MET ARG LEU SER Stop - C

Explanation:

In protein synthesis, the ribosome reads mRNA in the 5´ to 3´ direction, and, according to the codons that are being readen, tRNA transfers the correct amino acids to build the polypeptide chain. A codon is a short sequence of three nucleotides that store the genetic information for the aminoacids´ assembly. Each tRNA has two important sites. One of them that couples with the codon of the mRNA molecule, named anticodon. The other site couples with an amino acid. tRNA allows amino acids to align according to the nucleotidic sequence in the mRNA molecule.

Once the new amino acid links to the growing peptidic chain, the binding between the amino acid and the tRNA molecule breaks. The tRNA is now free to join another amino acid and repeat the cycle.

The protein is synthesized from the amino terminus to the carboxy terminus, while the added amino acids to the chain are coded by a codon formed by three bases in the mRNA. mARNs also have a start and end codon that are the signals of the synthesis initiation and finish. When the ribosome reaches the end codon, protein synthesis is over.

Each of the codons represents one of the 20 amino acids used to build the protein. Each amino acid can be codified by more than one codon. From the total 64 codons, 61 codify amino acids, and one of them is a start codon. The left three codons are stopping translation points.

The codons indicating the initiation or stop points during the translation process are:

• The start codon AUG is the most common sequence used by eukaryotic cells and places near the 5´extreme of the molecule.

• The end codons are UAA, UAG, UGA.

Protein synthesis initiates in the AUG start codon -Metionin-, and ends when reaching either of the stop codons UAA, UAG, UGA.

In the exposed example we have the following mRNA.

mRNA ⇒ 5'GMU UAC AUG CGG CUC AGU UGA GGC GAA AAA A 3'

Codons are separated by a space left between them. AUG is the start codon placed near the 5´ extreme. UGA is the end codon near the 3´ extreme. tRNA will add amino acids from the start codon, not before.

tRNA ⇒ UAC GCC GAG UCA ACU

Anticodons are separated by a space left between them.

protein ⇒ N - MET ARG LEU SER Stop - C

Each mRNA codon codifies for an amino acid. The start codon codifies for methionine. AUG = Met, CGG = Arg, CUC = Leu, AGU = Ser, UGA = Stop codon. The amino terminus is represented as an N and the carboxy terminus is a C. The first extreme to be translated carries the amino-terminal group, while the other extreme carries the carboxy-terminus group.

5 0

3 years ago

Natural systems (respiring animals, decomposition, fires, the ocean) contribute approximately 700 giga-tons of Carbon (GtC) to t

mina [271]

Answer:

Around 25-30 gigatons.

Explanation:

Although natural processes do produce much more carbon dioxide than humans, its a delicate balance and all of that carbon dioxide is absorbed back. However, when humans arrived, they disrupted that balance, and even with the relatively small amount it is creating big problems.

7 0

4 years ago

After buying a new house by the lake, the Harrison's decided to cut down the trees and bushes that were blocking

madam [21]

Sediment . The trees was blocking the view so its organic

5 0

3 years ago

Gametes that are motile are often called _____.

laiz [17]

Gametes that are motile are often called sperm.

6 0

3 years ago

Read 2 more answers

Prokaryotic cells found in extreme, harsh environments often belong to the domain:

Oksana_A [137]

Answer: Achaea.

Archaea are prokaryotic cells found in extreme, harsh environment.

Explanation:

Archaea are single celled prokaryotic microorganisms that lack cell nuclei.Archaea are extremophiles that live in extreme high and harsh environments like hot springs and salt lakes.They reproduce asexually by binary fission, fragmentation and budding. They are salt tolerant that use sunlight as energy.

5 0

4 years ago