IB
Biology (New Syllabus)
Question Bank
Free International Baccalaureate Diploma Programme Exam Style Questions
Explore the fascinating world of Biology with our free International Baccalaureate Diploma Programme questions and answers. Test your understanding of diverse biological concepts and refine your knowledge with our comprehensive question bank, designed to aid your studies and prepare you for the first examinations in 2025.
Question 1
A molecule was found to have the base sequence AGCAGGCA. What can be deduced about the molecule based on this information?
[ 1 ]
A.
It can only be DNA.
B.
It can be be RNA.
C.
It could either be RNA or DNA.
D.
It is single-stranded.
Rationale
Since no thymines or uracils are present, this molecule could either be DNA or RNA.
Question 2
The antisense strand of a DNA molecule has the sequence 5' AGTACCACT 3'. What sequence would the mRNA produced have?
[ 1 ]
A.
AGTACCACT
B.
TCATGGTGA
C.
AGUACCACU
D.
UCAUGGUGA
Rationale
The antisense strand is the strand which is transcribed. The mRNA will have a complementary sequence to the antisense strand.
The mRNA has the same sequence as the sense strand except that thymine is replaced by uracil.
Question 3
Which of the following processes are post-transcriptional modifications of mRNA?
- Addition of a 5' cap
- Addition of poly A tail
- Removal of exons
[ 1 ]
A.
III only
B.
I and II only
C.
I and III only
D.
I, II and III
Rationale
Introns are spliced from the mRNA.
Question 4
Which of the following statements about adhesion and cohesion is true?
[ 1 ]
A.
Interaction of water with the xylem involves only adhesion
B.
Interaction of water with soil minerals involves only cohesion
C.
Transpiration pull involves only adhesion
D.
Movement of water in soil involves only cohesion
Question 5
What is the bond found between these two monosaccharides called?
[ 1 ]
[© Abaccus Ltd 2022]
A.
Peptide bond
B.
Ester bond
C.
Glycosidic bond
D.
Hydrogen bond
Question 6
Where does the proton gradient needed for the production of ATP develop in chloroplasts?
[ 1 ]
[© Abaccus Ltd 2022]
A.
A
B.
B
C.
C
D.
D
Rationale
Protons accumulate in the thylakoid space, allowing a proton gradient to be established quickly.
Question 7
Which of the following statements accurately describes the relationship between genetic material and viruses?
[ 1 ]
A.
DNA is the genetic material of all living organisms, including viruses.
B.
Some viruses utilise RNA as their genetic material, but are not considered to be living.
C.
Some viruses utilise DNA as their genetic material, and are considered to be living.
D.
Some viruses utilise RNA as their genetic material, and are considered to be living.
Rationale
Viruses may utilise either RNA or DNA as their genetic material. However, they are not considered to be living as they require a host in order to survive and reproduce.
Question 8
Which of the following is an example of a non-conjugated protein?
[ 1 ]
A.
Hemoglobin
B.
Myoglobin
C.
Insulin
D.
Chlorophyll
Rationale
Insulin is an example of a non-conjugated protein. This means that it is composed solely of amino acids and does not contain a non-protein component, unlike conjugated proteins like hemoglobin which contains a heme group.
Question NaN
A molecule was found to have the base sequence AGCAGGCA. What can be deduced about the molecule based on this information?
[ 1 ]
A.
It can only be DNA.
B.
It can be be RNA.
C.
It could either be RNA or DNA.
D.
It is single-stranded.
Rationale
Since no thymines or uracils are present, this molecule could either be DNA or RNA.
Want to see more?
Subscribe for free access to more IB exam past paper questions. Find multiple choice and structured questions waiting for you!