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Chemistry
How much percentage (%) of the Earth's Surface is covered with water?
A
70% (71%)
B
60
C
50
D
40
Correct Answer
A
Chemistry
Amino acids are building blocks of ______?
A
Nucleic acids
B
Protein
C
Vitamins
D
Lipid
Correct Answer
B
Biology
Which condition results from an extra copy of chromosome 21?
A
Turner syndrome
B
Klinefelter syndrome
C
Down syndrome
D
Edwards syndrome
Correct Answer
C
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