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Worksheets2020 Biology HSC MC
Total questions: 20
Worksheet time: 34mins
In maintaining homeostasis, which of the following is a behavioural adaptation?
Sweating to cool down
Curling up in a ball to keep warm
Speeding up or slowing down cell metabolism
Skin going red as more blood flows to surface
Sexual reproduction in plants involves
pollination caused by dispersal of seeds.
cloning as it creates copies of the parent plant.
mitosis leading to the formation of pollen grains.
fertilisation as a result of fusion of male and female gametes.
The following four events occur during reproduction in a placental mammal.
1. Fertilisation
2. Implantation
3. Ovulation
4. Placental formation
In which order do these events occur?
2, 1, 3, 4
2, 4, 1, 3
3, 1, 2, 4
3, 2, 4, 1
Malaria is a disease in humans caused by a single-celled Plasmodium species. It is transmitted by female mosquitoes. Which of the following is true for malaria?
Both Plasmodium and the mosquito are vectors
Both Plasmodium and the mosquito are pathogens
The mosquito is the vector and Plasmodium is the pathogen
The mosquito is the pathogen and Plasmodium is the vector
Which row of the table best describes DNA in both prokaryotic and eukaryotic cells?
A
B
C
D
Citrus canker is a bacterial disease that originates in south-east Asia and affects citrus fruit. What would be the most effective way to prevent the disease from spreading into or across Australia?
Monitor citrus trees and fruit continuously.
Certify orchards before fruit is transported.
Keep citrus trees and fruit entering Australia in quarantine stations until the incubation period has passed.
Inspect citrus trees and fruit entering Australia in quarantine stations before transportation across Australia.
Students designed and conducted an investigation to test for the presence of microbes in THREE different food samples. They inoculated agar plates with the samples and placed them in an incubator set to 25°C. Which row of the table represents a valid design for the investigation?
A
B
C
D
Quarantine is ineffective as a measure to control non-infectious diseases because they
cannot develop in isolation.
depend on long-term exposure to a pathogen.
may be inherited and affect the organism all their life.
may only be treated by genetic engineering altering cells.
A public education campaign was developed with the aim of lowering the incidence of skin cancer in the population. The campaign was adopted Australia wide and is illustrated in the poster.
Which is the best method to measure the effectiveness of the campaign?
By measuring exposure to the sun and skin cancer incidence
By surveying beachgoers, asking if they remember the campaign
By comparing skin cancer incidence before and after the campaign
By counting the number of people on the beach wearing hats and sunglasses
A farmer intends to artificially inseminate cows with semen from a bull which has been chosen based on characteristics of colour and muscle mass. The farmer does not know that the bull is heterozygous for a rare recessive allele not previously present in the farmer’s cow population. The introduction of this recessive allele to the population of cows is an example of
gene flow.
genetic drift.
natural selection.
selective breeding.
The diagram shows a model of the human eye.
Which of the following correctly identifies a labelled part and its function?
What is the purpose of cloning in agriculture?
Increasing the frequency of recessive traits
Preserving favourable traits in the offspring
Preserving genetic variability in a population
Increasing combinations of alleles in a population
A type of genetic technology is shown in the diagram.
What type of cloning is modelled?
Gene cloning because bacteria are used.
Gene cloning because a human gene is being replicated.
Whole organism cloning because identical offspring are produced.
Whole organism cloning because the bacteria use asexual reproduction.
A normal allele results in liver cells with sufficient cholesterol receptors. A different allele results in liver cells without cholesterol receptors. Individuals who are heterozygous have liver cells with insufficient cholesterol receptors.
What type of inheritance is the most likely explanation for this?
Sex-linked
Autosomal dominant
Autosomal recessive
Incomplete dominance
Four antiviral drugs have been tested in a culture of human cells for their effectiveness in inhibiting infection from a new virus. The toxicity of the antivirals to human cells was also tested. The ability of the drugs to inhibit viral entry to the cells (% inhibition) and the proportion of the cells killed by the drugs (% toxicity) were recorded at different doses of each drug and shown in the graphs. From the results shown, which antiviral drug is the safest and most effective at a dose of 1µmol L–1?
Analysis of DNA shows that adenine and guanine always make up 50% of the total amount of nitrogenous bases in DNA.
Which structural feature of DNA does this provide evidence for?
DNA is helical in structure.
DNA is always a double-stranded molecule.
DNA always has adenine paired with guanine.
DNA is made up of equal amounts of nitrogenous bases.
There are about 10 million single nucleotide polymorphisms (SNPs) found in the human genome.
Four SNPs are modelled in the diagram.
The SNPs modelled do not affect the phenotype of the individuals shown.
Which is the best explanation for this?
Only one nucleotide is different at each SNP.
The SNPs are part of DNA that is not expressed.
AGA, CAA, TAT and CTC all code for the same amino acid.
The SNPs are present on one strand of the DNA molecule only.
SNP databases have been used in forensic investigations. One is outlined below.
1. DNA was collected at a crime scene 30 years ago.
2. Recently the crime scene DNA was analysed at 700 000 SNP locations.
3. An SNP profile was created and uploaded to a genealogy database.
4. The SNP profile from the crime scene indicated some shared SNPs with two individuals (who did not have SNPs in common).
5. The pedigrees were constructed for the two individuals.
Which person is most likely to be the suspect who should be investigated?
A
B
C
D
Which diagram correctly models one phase of meiosis in an organism that has six chromosomes in its somatic cells?
This chart illustrates three correlation patterns indicating the influence of genes and environment on different traits in individuals.
What does the data show about how genes and family environment affect the three traits?
