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WorksheetsBiology Semester 1
Total questions: 40
Worksheet time: 37mins
Which of the following is NOT the importance of DNA replication?
To ensure each daughter cell receives the same number chromosome
To increase genetic variation
To synthesize histone proteins
To increase the amount of DNA
Prophase
Metaphase
Anaphase
Telophase
During the process of meiosis, chromosomes replicate
once, during interphase I
once, during interphase II
twice, during prophase I and II
twice, during interphase I and II
Which of these can change allele frequencies in a population?
Sexual selection
Genetic drift
Gene flow
Natural selection
All of these can change allele frequencies
The ability to taste PTC is controlled by the dominant allele T, while the inability to taste PTC is controlled by the recessive allele t, In a population, 70% can taste PTC. By assuming the population is in equilibrium, what is the frequency of allele t in the population mentioned?
0.20
0.30
0.55
0.55
Which of the following help to hold the DNA strands apart while they are being replicated?
Primase
Single-strand binding protein
DNA Ligase
Primase
Which RNA bases would pair with 3'TACGAA5' in transcription?
5'AUGCUU3'
5'ATGCTT3'
5'GCATCC3'
5'GCAUCC3'
Why is only one strand of DNA transcribed into mRNA?
Because mRNA is only required in small quantities.
Because the other strand would produce the same amino acid sequence in reverse order.
Because all genes are located on the same DNA strand, while the other strand acts as protection.
Because transcribing both DNA strands would produce different amino acid sequences.
The lac operon genes only become expressed if:
allolactose binds to the repressor protein
glucose binds to the repressor protein
lactose binds to the lac operator
the repressor protein binds to the lac operator
The mutated DNA segment is TTACGCAAC. This is an example of ___ mutation.
Base Insertion only
Base Substitution only
Base Deletion only
Base Insertion and Base Deletion
The illustration shows the result of which effect of mutation?
Silent mutation
Missense mutation
Nonsense mutation
Which of the following is a circular DNA from bacteria that can hold a foreign DNA?
plasmid
restriction enzyme
ligase
protein expression
The first step to genetic engineering is:
isolate desired gene
Cut DNA strand
Reconnect DNA fragements
Produce proteins
The unpaired nucleotide sequences produced by the action of restriction enzymes are referred to as
sticky ends
base pairs
single strands
restriction fragments
Which of the following is correct about host cell?
Plasmid is an example of host cell.
Unable to receive DNA molecule through transformation.
An organism that prevents cloning vectors from multiplying.
An organism that is used to receive recombinant DNA for cloning purposes.
The graph above shows the level of hormones in the female reproductive cycle.
Which of the following shows the menstrual period?
I
II
III
IV
Which of the following statements is NOT TRUE about hormonal control during birth in humans?
The posterior lobe of pituitary gland secretes the oxytocin hormone.
The anterior lobe of the pituitary gland secretes the prolactin hormone.
The release of the prostaglandins hormone from the placenta is increased.
The level of progesterone hormone in blood is higher than estrogen hormone.
Arrange the CORRECT sequence of sperm movement.
1. Urethra
2. Ejaculatory duct
3. Release from body
4. Epididymis
5. Vas deferens
6. Seminiferous tubule
4, 5, 6, 1, 2, 3
4, 6, 5, 1, 2, 3
6, 4, 5, 2, 1, 3
6, 5, 4, 1, 2, 3
Which of the following is true about fruit development after double fertilisation?
The diploid zygote develops into the cotyledon
The ovule develops into the fruit
The integuments develop into seed coat
The triploid nucleus develops into the embryo
When does the secondary oocyte complete its second meiotic division?
When the corpus luteum degenerates
During ovulation
When it is penetrated by a sperm
While waiting for the arrival of sperm in the Fallopian tube
A fertilized egg undergoes several stages before it is successfully implanted. The diagram below shows these stages as the fertilized egg travels through the female reproductive system.
In which of the following structures of the female human reproductive system is the blastocyst implanted during normal human development?
Overy
Uterus
Vagina
Amniotic sac
The pattern of growth shown by Shorea sp., a woody plant found in the tropical rainforests is ..........
Limited growth
Unlimited growth
Allometric growth
Isometric growth
What are polyribosomes?
Groups of ribosomes reading a single mRNA simultaneously.
Ribosomes containing more than two subunits.
Multiple copies of ribosomes associated with giant chromosomes.
Aggregations of vesicles containing ribosomal RNA.
Which of the following enzyme will make staggered cuts?
EcoRI
SmaI
DNA ligase
Reverse transcriptase
Which of the following statement describe Annealing in PCR?
To catalyse the synthesis of the second DNA strand
forming double stranded cDNA
To catalyses the synthesis of the single strand complementary DNA
The joining of DNA primers complementary to sequences DNA template
The joining of the RNA primer complementary to the sequences of DNA template
Which of the following is the NOT the difference between plasmid and chromosome?
Plasmid can be used as cloning vector while chromosome cannot be used as cloning vector
Plasmid not associate with histone protein while chromosome is associate with histone protein
Plasmid involve in heredity while chromosome does not involve in heredity
Plasmid is circular while chromosome is linear or circular
What happens to the embryo sac after fertilisation?
Develop into seed
Differentiate into plumule
Differentiate into radicle
Develop into ovule
All of the following is the structure of blastocyst EXCEPT
Trophoblast
Morula
Blastocoel
Inner cell mass
Which of the following that cause genetic variation?
Synapsis
Cytokinesis
DNA replication
Random arrangement
Which of the following describe allometric growth?
Change in size is not accompanied by change in shape of the organism.
Change in size is accompanied by change in shape of the organism.
Growth is complete when the organism achieves its maximum size.
Growth continues until death
Why estrogen increase at the end of pregnancy?
To stimulate formation of oxytocin receptor
To stimulate development of placenta
To stimulate hormone prolactin
To stimulate ovulation
