AQA A-LEVEL BIOLOGY COMPLETE QUESTIONS AND
ANSWERS WITH VERIFIED SOLUTION GRADE A+
1. In the human circulatory system, where does oxygenated blood first
enter after being pumped from the lungs?
A. Left atrium
B. Left ventricle
C. Right atrium
D. Right ventricle
Answer: A) Left atrium
Rationale: Oxygenated blood from the lungs enters the left atrium
before being pumped into the left ventricle for distribution to the body.
2. Which of the following statements about enzymes is correct?
A. Enzymes are consumed in reactions
B. Enzymes increase the activation energy of a reaction
C. Enzymes lower the activation energy of a reaction
D. Enzymes work best at low temperatures
Answer: C) Enzymes lower the activation energy of a reaction
Rationale: Enzymes act as catalysts by lowering the activation energy
required for a reaction to proceed.
3. Which process results in the formation of mRNA from a DNA
template?
,A. Translation
B. Replication
C. Transcription
D. Transformation
Answer: C) Transcription
Rationale: Transcription is the process by which RNA, specifically
mRNA, is synthesized from a DNA template.
4. Which of the following is an example of a homologous structure?
A. Wings of a bird and a bat
B. Eyes of a squid and a human
C. Fins of a fish and a whale
D. Teeth of a dog and a lion
Answer: D) Teeth of a dog and a lion
Rationale: Homologous structures are those that have a similar
evolutionary origin but may serve different functions.
5. Which process is responsible for creating genetic variation in
sexually reproducing organisms?
A. Mutation
B. Meiosis
C. Mitosis
D. Replication
, Answer: B) Meiosis
Rationale: Meiosis generates genetic diversity through processes like
crossing over and independent assortment of chromosomes.
6. What is the name of the process by which RNA is synthesized from a
DNA template?
A. Replication
B. Translation
C. Transcription
D. Duplication
Answer: C) Transcription
Rationale: Transcription is the process by which RNA is synthesized
from a DNA template.
7. Which of the following types of RNA carries genetic information
from DNA to the ribosome?
A. rRNA
B. tRNA
C. mRNA
D. miRNA
Answer: C) mRNA
Rationale: mRNA (messenger RNA) carries the genetic code from
DNA to the ribosome for protein synthesis.
ANSWERS WITH VERIFIED SOLUTION GRADE A+
1. In the human circulatory system, where does oxygenated blood first
enter after being pumped from the lungs?
A. Left atrium
B. Left ventricle
C. Right atrium
D. Right ventricle
Answer: A) Left atrium
Rationale: Oxygenated blood from the lungs enters the left atrium
before being pumped into the left ventricle for distribution to the body.
2. Which of the following statements about enzymes is correct?
A. Enzymes are consumed in reactions
B. Enzymes increase the activation energy of a reaction
C. Enzymes lower the activation energy of a reaction
D. Enzymes work best at low temperatures
Answer: C) Enzymes lower the activation energy of a reaction
Rationale: Enzymes act as catalysts by lowering the activation energy
required for a reaction to proceed.
3. Which process results in the formation of mRNA from a DNA
template?
,A. Translation
B. Replication
C. Transcription
D. Transformation
Answer: C) Transcription
Rationale: Transcription is the process by which RNA, specifically
mRNA, is synthesized from a DNA template.
4. Which of the following is an example of a homologous structure?
A. Wings of a bird and a bat
B. Eyes of a squid and a human
C. Fins of a fish and a whale
D. Teeth of a dog and a lion
Answer: D) Teeth of a dog and a lion
Rationale: Homologous structures are those that have a similar
evolutionary origin but may serve different functions.
5. Which process is responsible for creating genetic variation in
sexually reproducing organisms?
A. Mutation
B. Meiosis
C. Mitosis
D. Replication
, Answer: B) Meiosis
Rationale: Meiosis generates genetic diversity through processes like
crossing over and independent assortment of chromosomes.
6. What is the name of the process by which RNA is synthesized from a
DNA template?
A. Replication
B. Translation
C. Transcription
D. Duplication
Answer: C) Transcription
Rationale: Transcription is the process by which RNA is synthesized
from a DNA template.
7. Which of the following types of RNA carries genetic information
from DNA to the ribosome?
A. rRNA
B. tRNA
C. mRNA
D. miRNA
Answer: C) mRNA
Rationale: mRNA (messenger RNA) carries the genetic code from
DNA to the ribosome for protein synthesis.
