Unit 2 Exam review biology

Which base pairs with adenine?

• Thymine in DNA, Uracil in RNA

• Uracil in DNA, Thymine in RNA

• Cytosine in DNA, Guanine in RNA

• Cytosine in DNA, Guanine in RNA

Which base always pairs with cytosine?

• Thymine

• Adenosine

• Guanine

• Cytosine

Which of the following is NOT a function of RNA?

• is part of the structure of ribosomes

• stores the information about all of life's processes

• brings amino acids to the ribosome

• serves as a temporary mobile copy of the DNA's instructions

Which is not true of DNA?

• contains nitrogenous base Thymine

• stores genetic information for all of life's processes

• has a double stranded helix structure

• it contains the nitrogenous base uracil

What is the role of DNA polymerase enzymes in replication?

• connecting the fragments of the lagging strand of DNA

• unzipping the double helix by breaking down the hydrogen bonds

• adding the free nucleotides to the complementary strand of DNA

• splitting the DNA molecule

What is true about the AUG codon?

• It codes for Methionine (MET) amino acids

• it signals the beginning of protein production

• All additional AUG sequences immediately begin production of a new protein

• It is the universal stop codon

Which statement is false about variation in the genetic code?

• All organisms use the same codons

• they may result in diseases

• they may provide selective advantages

• slight differences in the genetic code may have significant results

What is the ribosome's function?

• To carry genetic messages from DNA

• To make polypeptides, which form proteins

• To break down proteins into amino acids

• To use nucleic acids to make mRNA

Which statements are true about translation?

• Translation occurs in the cell's nucleus

• Only Eukaryotes are able to carry out translation

• Ribosomal RNA is able to recognize mRNA and tRNA

• Translation occurs in ribosomes

In Transcription the __________________________ and transcribed onto mRNA

• mRNA is translated into amino acids

• Genes from DNA are transferred to RNA

• instructions on the DNA are copied

• instructions on the RNA are copied