Prepare with MCQs
Thousands of verified questions for competitive exams
25K+
MCQs
15+
Categories
500+
Tests
Free
Access
All
๐ General Knowledge
๐ Current Affairs
๐ต๐ฐ Pakistan Affairs
โช Islamic Studies
๐ค English
๐ป Computer
๐งฎ Mathematics
โ Physics
๐งช Chemistry
๐งฌ Biology
๐ฌ Everyday Science
๐ฉโ๐ซ Pedagogy
ุงุฑุฏู Urdu
๐บ World Geography
๐ History
Biology
Nondisjunction during meiosis can result in:
A
Polyploidy only
B
Aneuploidy
C
Identical twins
D
DNA replication
Correct Answer
B
Biology
The exchange of genetic material between homologous chromosomes is called:
A
Translation
B
Crossing over
C
Replication
D
Transduction
Correct Answer
B
Biology
Crossing over between homologous chromosomes normally occurs during:
A
Prophase I of meiosis
B
Prophase of mitosis
C
Metaphase II
D
Telophase II
Correct Answer
A
Biology
Which enzyme extends the ends of linear chromosomes?
A
DNA ligase
B
Telomerase
C
Primase
D
RNA polymerase
Correct Answer
B
Biology
A mutation caused by insertion or deletion of nucleotides that changes the reading frame is called:
A
Point mutation
B
Frameshift mutation
C
Silent mutation
D
Substitution
Correct Answer
B
Biology
Which mutation introduces a premature stop codon?
A
Silent mutation
B
Missense mutation
C
Nonsense mutation
D
Neutral mutation
Correct Answer
C
Biology
A mutation that changes a codon but does not change the encoded amino acid is called:
A
Missense mutation
B
Nonsense mutation
C
Silent mutation
D
Frameshift mutation
Correct Answer
C
Biology
Which process allows a single gene to produce multiple protein variants?
A
DNA replication
B
Alternative splicing
C
Binary fission
D
Translation termination
Correct Answer
B
Biology
In eukaryotic ells, introns are removed from pre-mRNA by?
A
Ribosomes
B
Spliceosomes
C
Lysosomes
D
Centrioles
Correct Answer
B
Biology
During transcription, RNA polymerase reads the DNA template strand in which direction?
A
5? to 3?
B
3? to 5?
C
Both directions simultaneously
D
Randomly
Correct Answer
B