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In DNA, the nucleotide containing adenine always pairs with the nucleotide containing _______.
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Chromosomes are made of macromolecules from which of the following classes?
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practice exam 4

Biology- exam 4- practice exam

QuestionAnswer
In DNA, the nucleotide containing adenine always pairs with the nucleotide containing _______. Thymine
Chromosomes are made of macromolecules from which of the following classes? Nucleic acids and proteins
Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? 8%
Which of the following statements CORRECTLY describes the eukaryotic chromosome? It consists of linear molecules of double-stranded DNA
In the synthesis of a polynucleotide strand of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and which of the following atoms or molecules of the last nucleotide in the polymer? the 3' OH
What is meant by the description "antiparallel" regarding the two strands that make up the DNA double helix? The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
Which of the following removes the RNA nucleotides from the primer and adds equivalent DNA nucleotides to the 3' end of Okazaki fragments? DNA polymerase I
DNA differs from RNA in that: RNA has a hydroxyl group attached to its 2' carbon, whereas DNA does not in the sugar of the nucleotides
In E. coli, a type of bacteria, there is a mutation in a gene that alters the helicase that normally acts at the origin of replication. Which of the following events would be most likely to occur as a result of this mutation? No replication fork will be formed.
In DNA replication, the resulting daughter molecules contain one strand of the original parental DNA and one new strand. What is the explanation for this phenomenon? DNA replication is semiconservative.
Using the figure above, the lagging strand of DNA that is synthesized uses which strand as the template strand? the top strand in the DNA molecule being shown
What are telomeres? the ends of linear chromosomes
Which of these mechanisms ensures that DNA replication is accurate? complementary base pairing, mismatch repair, proofreading, excision repair, all of the above
If a cell were unable to produce histone proteins, which of the following results would be a likely effect on the cell? The cell's DNA could not be packed into its nucleus.
The two strands of DNA are held together by: Hydrogen bonds
Which of the following statements correctly describes the structure and types of chromatin? Heterochromatin is highly condensed, whereas euchromatin is less compact.
Which of the following processes correctly describes alternative RNA splicing? It can allow the production of proteins of different sizes and functions from a single pre-mRNA.
Which of the following help(s) to stabilize mRNA by inhibiting its degradation? 5' cap and poly (A) tail
In which of the following actions does RNA polymerase differ from DNA polymerase? RNA polymerase can initiate RNA synthesis, but DNA polymerase requires a primer to initiate DNA synthesis.
Which of the following molecular structures contain codons? mRNA
The genetic code is redundant (or sometimes also called degenerate). What is meant by this statement? More than one codon can specify the addition of the same amino acid.
The process of translation most directly makes what level of protein structure? Primary
Which of the following processes occurs in prokaryotes but NOT in eukaryotes? coupling of transcription and translation to occur simultaneously
Aminoacyl tRNA synthases are: enzymes that add the correct tRNA to a specific amino acid
A particular triplet of bases in the template strand of DNA is 3’-AGT-5’ What would be the corresponding codon for the mRNA that is transcribed? 5'-UCA-3’
What are ribosomes composed of? both rRNA and protein parts in two subunits.
The anticodon of a particular tRNA molecule is: complementary to the corresponding mRNA codon.
number protein synthesis sequence. 1. An aminoacyl-tRNA binds to A site. 2. Peptide bond forms between the new amino acid and a polypeptide chain. 3. tRNA leaves P site and moves to the E site. 4. Small ribosomal subunit binds with mRNA. 5. Stop 4, 1, 2, 3, 5
What is the function of the release factor during translation in eukaryotes? It binds to the stop codon in the A site in place of a tRNA.
The source of free energy to drive the process of translation is: GTP hydrolysis
What are polyribosomes? groups of ribosomes reading a single mRNA simultaneously
Which of the following statements is the BEST current description of a gene? a DNA sequence that is expressed to form a functional product: either RNA or polypeptide
Created by: josie_d
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