Question

1. Which of the following statements about the flow of genetic information is true?

a. Proteins encode information that is used to produce other proteins of the same amino acid sequence.

b. RNA encodes information that is translated into DNA, and DNA encodes information that is translated into proteins.

c. Proteins encode information that can be translated into RNA, and RNA encodes information that can be transcribed into DNA.

d. DNA encodes information that is translated into RNA, and RNA encodes information that is translated into proteins.

e. None of the above

2. RNA polymerase uses the _______ DNA template to synthesize a _______ mRNA.

a. 5′ to 3′; 5′ to 3′

b. 3′ to 5′; 3′ to 5′

c. 5′ to 3′; 3′ to 5′

d. 3′ to 5′; 5′ to 3′

e. Examples of all of the above have been found.

3. Which of the following molecules transfers information from mRNA to protein?

a. DNA

b. mRNA

c. tRNA

d. Proteins

e. Lipids

4. The genetic code is best described as

a. redundant but not ambiguous.

b. ambiguous but not redundant.

c. both ambiguous and redundant.

d. neither ambiguous nor redundant.

e. nonsense.

5. The three codons in the genetic code that do not specify amino acids are called

a. missense codons.

b. start codons.

c. stop codons.

d. promoters.

e. initiator codons.

6. DNA is composed of two strands, only one of which typically is used as a template for RNA synthesis. By what mechanism is the correct strand chosen?

a. Both strands are tried and the one that works is remembered.

b. Only one strand has the start codon.

c. The promoter acts to aim the RNA polymerase.

d. A start factor informs the system.

e. It is chosen randomly.

7. The major phenotypic expression of genotype is in

a. proteins.

b. tRNA.

c. mRNA.

d. nucleic acids.

e. a mutation.

8. Which of the following mutations would probably be the most deleterious?

a. A missense mutation in the second codon

b. A frameshift mutation in the second codon

c. A nonsense mutation in the last codon

d. A silent mutation in the second codon

e. All of the above would be equally deleterious.

9. Which of the following molecules transfers information from the nucleus to the cytoplasm?

a. DNA

b. mRNA

c. tRNA

d. Proteins

e. Lipids

10. Transcription is the process of

a. synthesizing a DNA molecule from an RNA template.

b. assembling ribonucleoside triphosphates into an RNA molecule without a template.

c. synthesizing an RNA molecule using a DNA template.

d. synthesizing a protein using information from a messenger RNA.

e. replicating a single-stranded DNA molecule.

11. If the codon is 5¢-GAA-3¢, then the corresponding anticodon is

a. 5¢-GAA-3¢.

b. 3¢-GAA-5¢.

c. 5¢-CUU-3¢.

d. 3¢-CUU-5¢.

e. 3¢-CTT-5¢.

12. Which of the following statements about pre-mRNA splicing is false?

a. It removes introns in eukaryotic genes.

b. It is performed by small nuclear ribonucleoprotein particles (snRNPs).

c. It is common in prokaryotes.

d. It is directed by consensus sequences.

e. It shortens the RNA molecule.

Answer 1

1. Which of the following statements about the flow of genetic information is true?

answer- d. DNA encodes information that is translated into RNA, and RNA encodes information that is translated into proteins.

information flows from DNA --- RNA --- Protein

please give a thumbs up!!!!!thank you!!!!