Which of these components is NOT part of the structure of DNA?
Phosphate group
Ribose sugar
✓
Deoxyribose sugar
Adenine
Correct Answer
Ribose sugar
The shared property is being a component of DNA structure. Deoxyribose sugar, a phosphate group, and adenine (a nitrogenous base) are all components of DNA. Ribose sugar is a component of RNA, not DNA.
Question 2
Which of these molecules or complexes is NOT directly involved in the process of translation?
RNA polymerase
✓
tRNA
mRNA
Ribosome
Correct Answer
RNA polymerase
The shared property is being directly involved in the process of translation. The ribosome, tRNA, and mRNA are all directly involved in translation. RNA polymerase is the enzyme primarily responsible for transcription.
Question 3
Which of these is NOT a universally accepted characteristic of DNA replication?
Conservative
✓
Semiconservative
Requires DNA polymerase
Occurs in the 5' to 3' direction
Correct Answer
Conservative
The shared property is being a universally accepted characteristic of DNA replication. Semiconservative, requiring DNA polymerase, and occurring in the 5' to 3' direction (for synthesis) are all accepted characteristics. The conservative model of replication was disproven.
Question 4
Which of these types of RNA does NOT carry an anticodon sequence?
rRNA
mRNA
tRNA
✓
snRNA
Correct Answer
tRNA
The shared property is being a type of RNA that does not carry an anticodon sequence. mRNA, rRNA, and snRNA do not carry anticodon sequences. tRNA is specifically characterized by carrying an anticodon sequence.
Question 5
Which of these enzymes is NOT directly involved in forming phosphodiester bonds during DNA replication?
Helicase
✓
DNA polymerase
DNA ligase
Primase
Correct Answer
Helicase
The shared property is being an enzyme directly involved in forming phosphodiester bonds during DNA replication. DNA polymerase, DNA ligase, and Primase all form phosphodiester bonds. Helicase unwinds the DNA double helix but does not form phosphodiester bonds.
Question 6
Which of these is NOT a post-transcriptional modification of mRNA in eukaryotes?
5' capping
Poly-A tail addition
Histone acetylation
✓
Intron splicing
Correct Answer
Histone acetylation
The shared property is being a post-transcriptional modification of mRNA in eukaryotes. 5' capping, poly-A tail addition, and intron splicing are all modifications of the pre-mRNA transcript. Histone acetylation is a chromatin modification involved in gene regulation, not a modification of the mRNA molecule itself.
Question 7
Which of these is NOT a DNA sequence component of a bacterial operon?
Repressor protein
✓
Structural genes
Promoter
Operator
Correct Answer
Repressor protein
The shared property is being a DNA sequence component of a bacterial operon. The promoter, operator, and structural genes are all DNA sequences within an operon. A repressor protein is a protein that binds to the operator, not a DNA sequence itself.
Question 8
Which of these is NOT a type of point mutation that results from a single nucleotide substitution?
Nonsense mutation
Frameshift mutation
✓
Missense mutation
Silent mutation
Correct Answer
Frameshift mutation
The shared property is being a type of point mutation resulting from a single nucleotide substitution. Missense, nonsense, and silent mutations all result from a single nucleotide substitution. A frameshift mutation typically results from the insertion or deletion of one or more nucleotides (not a multiple of three), which is not a simple substitution.
Question 9
Which of these is NOT considered a Mendelian inheritance pattern?
Autosomal recessive
X-linked recessive
Autosomal dominant
Mitochondrial
✓
Correct Answer
Mitochondrial
The shared property is being a Mendelian inheritance pattern. Autosomal dominant, X-linked recessive, and autosomal recessive are all classical Mendelian inheritance patterns. Mitochondrial inheritance is a non-Mendelian pattern.
Question 10
Which of these is NOT a characteristic property of the genetic code?
Degenerate
Ambiguous
✓
Universal
Non-overlapping
Correct Answer
Ambiguous
The shared property is being a characteristic property of the genetic code. The genetic code is degenerate, universal, and non-overlapping. It is not ambiguous; each codon specifies only one amino acid.
Question 11
Which of these enzymes is NOT primarily involved in DNA replication?
DNA ligase
RNA polymerase
✓
Helicase
DNA polymerase
Correct Answer
RNA polymerase
The shared property is being an enzyme primarily involved in DNA replication. DNA polymerase, Helicase, and DNA ligase are primarily involved in DNA replication. RNA polymerase is the primary enzyme for transcription.
Question 12
Which of these eukaryotic gene regulation mechanisms does not directly involve chemical modification or structural alteration of chromatin?
Histone acetylation
Nucleosome remodeling
DNA methylation
Enhancer binding
✓
Correct Answer
Enhancer binding
The shared property is being a eukaryotic gene regulation mechanism directly involving chemical modification or structural alteration of chromatin. Histone acetylation, DNA methylation, and nucleosome remodeling are direct modifications to chromatin or its components. Enhancer binding involves transcription factors binding to DNA sequences, which can influence chromatin, but it is not a direct chemical or structural modification of the chromatin itself.
Question 13
Which of these is NOT a characteristic feature of lagging strand DNA synthesis?
DNA ligase activity
Multiple RNA primers
Okazaki fragments
Continuous synthesis
✓
Correct Answer
Continuous synthesis
The shared property is being a characteristic feature of lagging strand DNA synthesis. Okazaki fragments, multiple RNA primers, and DNA ligase activity (to join fragments) are all features of lagging strand synthesis. Continuous synthesis is characteristic of the leading strand.
Question 14
Which of these is NOT a type of chromosomal structural rearrangement?
Inversion
Deletion
Aneuploidy
✓
Duplication
Correct Answer
Aneuploidy
The shared property is being a type of chromosomal structural rearrangement. Deletion, duplication, and inversion are all types of structural rearrangements of chromosomes. Aneuploidy refers to a change in the number of chromosomes, not their structure.
Question 15
Which of these bonds is NOT a covalent bond typically found in a DNA molecule?
Ester bond
N-glycosidic bond
Hydrogen bond
✓
Phosphodiester bond
Correct Answer
Hydrogen bond
The shared property is being a covalent bond typically found in a DNA molecule. Phosphodiester bonds, N-glycosidic bonds, and ester bonds (which are part of phosphodiester bonds) are all covalent bonds found in DNA. Hydrogen bonds are non-covalent interactions that form between complementary bases, holding the two DNA strands together.