Question

13. Why do cells need both tRNA and mRNA? (1 point)

Only mRNA can be used to repair mistakes in the DNA sequence.
Only tRNA bends into a shape that can carry specific amino acids.
The tRNA in used on the ribosomes and the mRNA is used in the nucleus.
The mRNA brings information to the nucleus for the tRNA to use.
14. (03.06 LC)
Mutation does not always affect the evolution of a species because (1 point)


not all mutations are inherited
not all mutations are beneficial
not all mutations cause visible change
not all mutations affect an entire species
15. (03.06 MC)
A chromosome that is exposed to a mutagen breaks into two pieces. A portion off one of the ends is removed before the two pieces rejoin. The mutation that occurs is (1 point)


deletion
duplication
inversion
non-disjunction
16. (03.06 MC)
Which of the following mutations is least likely to develop into a cancerous tumor? (1 point)


A non-disjunction mutation
A chromosomal deletion mutation
A inversion chromosomal mutation
A single point mutation
17. (03.06 MC)
The mutagens that result in cancer damage DNA by (1 point)


destroying the cell's p53 gene directly thereby increasing cell production
weakening the DNA strand or interfering with base paring
altering the cell's pH and allowing increased cell production
becoming a virus that attacks DNA directly, impairing duplication

Answer 1

1. tRNA is the one carrying amino acids

2. Mutation does not always affect the evolution of a species because not all mutations affect an entire species.

3. The type of chromosomal mutation that occurs here is an example of a deletion mutation. Specific genetic data, or DNA is removed and the remaining portions of chromosomal information have rejoined.

4. A chromosomal deletion mutation

5. The mutagens that result in cancer damage DNA by (b) weakening the DNA strand or interfering with base pairing. This mutagens are called carcinogens, if they cause a damage to a gene that makes a DNA repair protein, it means that a cell will have less ability to repair itself, and ,as a result, this will lead to formation of cancer.

Answer 2

Answer 1: Option (C):The tRNA in used on the ribosomes and the mRNA is used in the nucleus.

Answer 2:Option(C): There is no effect on the phenotype of a specie, as most of the species DNA is altered and there are a few changes which occurs inside the phenotype of any specie exposed to mutation in general.

Answer 3:Option(A):Deletion is a type of mutation during which the part of the genetic sequence or DNA is not placed at its original position but the loss of the fragment occurs, in the process causing the change in the genome of the specie.

Answer 4:Option (B): The weakening the DNA strand or interfering with base pairing of the DNA sequence inside the DNA molecules.

Step-by-step explanation:

1. tRNA is present inside the ribosomes, as it operates by detaching the required number of amino acids and letting the sequence change into the required proteins, which then goes out of the ribosomes into the cell body.
2. Mutation has no such effect on the phenotype or the visible properties of any specie. As much of the mutation which occurs is in the DNA sequence of the specie which is exposed to the effect.
3. Mutations basically brings change to the actual or original DNA sequence of the specie, as during the process a fragment or any part or sequence of nucleotide's are altered and are lost in the process to create a new DNA molecule, as the process is called as Deletion in the mutation term. As it will cause different disorders and the diseases inside the organism.
4. Carcinogen, there are different elements which causes different alterations in the DNA and in the over all genome of the specie. As the DNA sequence is altered and in the base pairing of the sequences inside the genome of the species.