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IB Biology Semester Exam 2024/2025
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IB Biology Semester Exam 2024/2025
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IB Biology Semester Exam 2024/2025A cell has a high density of rough endoplasmic reticulum (ER) in its
cytoplasm. Which other organelle can be expected to occur in large
numbers in this cell? - Precise Answer ✔✔Golgi apparatus
A gene has three alleles. How many different genotypes can be found for
this gene? - Precise Answer ✔✔6
A parent organism of unknown genotype is mated in a test cross. Half of
the offspring have the same phenotype as the parent. What can be
concluded from this result? - Precise Answer ✔✔The parent is
heterozygous for the trait
A polygenic character is controlled by two genes each with two alleles.
How many different possible genotypes are there for this character? -
Precise Answer ✔✔9
A red blood cell is 8 um in diameter. If drawn 100 times larger than its
actual size, what diameter will the drawing be in mm? - Precise Answer
✔✔0.8 mm
An unknown cell is observed using a microscope. A cell wall, ribosomes
and DNA are identified. What can be concluded form these
observations? - Precise Answer ✔✔It could be a prokaryotic or
eukaryotic cell
, During aerobic respiration in the cytoplasm of a cell, what is produced
from glucose?
I.) Pyruvate
II.) CO2
III.) ATP
IV.) Lactic acid - Precise Answer ✔✔I and III only
During which phase of the cell cycle do chromosomes duplicate? -
Precise Answer ✔✔S
How are plasmids used in biotechnology? - Precise Answer ✔✔For
gene transfer
How do prokaryotic cells divide? - Precise Answer ✔✔By binary fission
How many genotypes can be made from a gene which has three alleles?
- Precise Answer ✔✔6
Humans can respire aerobically and anaerobically. Which are products
of both aerobic cell respiration and anaerobic cell respiration in humans?
- Precise Answer ✔✔Pyruvate and ATP
If mRNA has a codon CAU, what is the corresponding anticodon on the
tRNA molecule? - Precise Answer ✔✔GUA
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