If a trna molecule has a anticodon which reads gcu, what was the codon of the mrna molecule
The codon of the mRNA molecule is CGA.
tRNA ( transfer RNA) molecule carries a sequence of three bases in its anticodon loop, which are complementary to the mRNA ( messenger RNA) codon. mRNA codon codes for a particular amino acid like CGA in this case codes for Arginne ( R), which is carried by the tRNA molecule in its amino acid attachment site.
When anticodon matches with the codon in the mRNA, amino acids are assembled in a particular order, which is dictated by the codon of mRNA.
Thus, the codon of mRNA for the anticodon GCU is CGA
12. If the new sequence codes for the same amino acid as the original cell, it will function normally. Silent mutation means that change in a nucleotide base will not affect amino acid. It will result in a different codon, but the one that code for the same amino acid, so the same protein will be produced.
13. CGA. In the RNA, base complements are adenine - uracil (A-U) and guanine - cytosine (G-C). So, when in the process of translation, anticodons of tRNA pairs with codons of mRNA, the complementary bases will pair.
14. Translation may not take place. If a new sequence contains stop codon, which is a signal for translation termination, translation may not take place.
15. Gamete mutations. Mutation are the alteration of a nucleotide sequence in DNA. By changing a DNA sequence, the mutations produce new sequences, and consequently the mutations add genetic variation. Gamete mutations are heritable
16. A change from CGA to AGA. A change from AUU to ACU changes isoleucine to threonine. A change from UGU to UGA changes cysteine to stop codon. A change from CGA to AGA changes arginine to arginine, other words, there is no change. A change from UUA to CUG changes stop codon to leucine.
17. Some people are more predisposed to developing cancer when exposed to mutagens. Individual differences must be taken into consideration.
18. The offspring will inherit neither the genotype nor the phenotype change. The germline mutations (mutation in sperm and egg cells) are heritable variations in the lineage of germ cells, but mutations in the body cells are not heritable because.
19. A decrease in crop diversity. Although a new genotype is created in the process of genetic engineering, it is unknown if it can reproduce with original plants.
20. The children's father must also carry the recessive allele. In autosomal recessive traits, such as cystic fibrosis, the phenotype is present if both copies of the recessive allele (a) are present (homozygous individuals aa). The recessive alleles are inherited one from mother and one from father.
21. Water sources can get contaminated and infect large groups of people. There are examples in the history of spreading such diseases, for example, typhoid, cholera, etc.
11. The right answer is Replication creates new DNA, while transcription creates mRNA.
The goal of replication is to duplicate the cell's DNA for cell division.
The purpose of transcription is to make the proteins necessary for the functioning, survival, and multiplication of the cell.
12. The right answer is If the new sequence codes for the same amino acid as the original cell, it will function normally.
Both strands of the parental DNA during replication each serve as a template for the synthesis of a new strand.
In this way, the two strands, instead of remaining together at each synthesis (conservative replication), always separate at each cycle (semi-conservative replication)
In the first generation, one strand of each double helix comes from the mother cell. In the second generation, there are only two strands of DNA from the mother cell for four double helices, etc.
13. The right answer is CGA
The canonical pairings between nucleobases, forming "Watson-Crick" base pairs, are, on the one hand, adenine with thymine (for DNA) or uracil (for RNA), and on the other hand, guanine with cytosine (for DNA and RNA).
14. The right answer is Translation may not take place.
The integrity of the mRNA is related to the integrity of the synthesized protein, so if the RNA is poorly transcribed, we obtain either a malformed protein or no protein at all.
15. The right answer is Gamete mutations
There are two main sources of genetic variation:
Mutations of gametes (permanent change of DNA in a gene.).
The gene combinations resulting from sexual reproduction.
16. The right answer is A change from CGA to AGA.
They both code for arginine
The least deleterious mutations are the neutral mutations (which make an amino acid change by another which has the same properties) and the silent mutations (a new codon is obtained which codes for the same amino acid as the first).
17. The right answer is B.
Tobacco use is the leading preventable risk factor for cancer. He is heavily involved in lung cancer as well as upper digestive tract cancer, that is to say:
Cancer of the tongue and mouth
cancer of the esophagus
18. The right answer is The offspring will inherit neither the genotype nor the phenotype change.
Because the transmission of genotypes to offspring is done only by the germ cells, not the somatic (of the body).
19. The right answer is decreasing in crop diversity
decrease in crop diversity, may be a sign of decreased plant fertility.
20. The right answer is A.
if both parents have the recessive mutant gene, then he has a 25% chance of inheriting the disease.
21. The right answer is A.
Water is a vital resource for humans. It must be of irreproachable quality and available in sufficient quantity. However, various circumstances can lead to contamination of the drinking water or cause a shortage, for example, a breakage or an aqueduct freeze, a drought, a flood or the presence of chemicals, parasites or cyanobacteria (blue-green algae). ) in water.
The anti-codons present on the tRNA binds to the codons present on the mRNA. tRNA carries only one type of amino acid and recognize only specific codon.
So, If a tRNA molecule has an anti-codon that reads GCU, it will bind to a CGA codon of the mRNA molecule.
Amino acid = Alanine