Biology Homework 6.2

A student is planning to draw a model of DNA and a model of RNA. Which of the following should the student include in the DNA model and NOT the RNA model?

• a double-helix

• the nucleotide uracil

• the sugar ribose

• a phosphate group

Which of the following is evidence that would support the claim that DNA has been transcribed into RNA?

• An identical, but disposable, copy of the DNA has been produced.

• A temporary, similar copy of the DNA has been produced.

• An exact, permanent copy of the DNA has been produced.

• A similar permanent copy of RNA has been produced and it replaces DNA.

Which statement correctly compares the impact of frameshift mutations and point mutations on polypeptides?

• Point mutations have a greater impact because they always change the resulting protein.

• Frameshift mutations have a greater impact because they always substitute the first nucleotide in a codon.

• Frameshift mutations have a greater impact because they usually shift the entire sequence following them.

• Point mutations have a greater impact because they always cause a change in the amino acid sequence.

Which flow chart best summarizes the process of protein synthesis?

• rRNA → DNA → mRNA

• Protein → mRNA → DNA

• mRNA → DNA → protein

• DNA → mRNA → protein

Leaves nucleus after transcription, attaches to a ribosome in the cytoplasm.

• mRNA

• tRNA

• rRNA

Carries amino acids to ribosomes during translation.

• mRNA

• tRNA

• rRNA

Together with proteins, forms ribosomes, which are the site of translation.

• tRNA

• mRNA

• rRNA