HSC Biology 2020 Multiple Choice Questions Welcome to your HSC Biology 2020 Multiple Choice Questions, we recommend completing it within 40 mins, however, you can submit it even after the timer. Congratulations, every quiz you take you earn a credit! 0 Credits 0 Social Points Make sure you have registered and logged in to keep your earnings. 1. In maintaining homeostasis, which of the following is a behavioural adaptation? Skin going red as more blood flows to surface Sweating to cool down Speeding up or slowing down cell metabolism Curling up in a ball to keep warm 2. Sexual reproduction in plants involves pollination caused by dispersal of seeds cloning as it creates copies of the parent plant. fertilisation as a result of fusion of male and female gametes mitosis leading to the formation of pollen grains. 3. The following four events occur during reproduction in a placental mammal. 1. Fertilisation2. Implantation3. Ovulation4. Placental formationIn which order do these events occur? 2, 1, 3, 4 2, 4, 1, 3 3, 1, 2, 4 3, 2, 4, 1 4. 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 pathogens Both Plasmodium and the mosquito are vectors The mosquito is the pathogen and Plasmodium is the vector The mosquito is the vector and Plasmodium is the pathogen 5. Which best describes DNA in both prokaryotic and eukaryotic cells respectively ? Linear, Circular Circular, Circular Linear, Linear Circular, Linear 6. 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 oracross Australia? Keep citrus trees and fruit entering Australia in quarantine stations until the incubation period has passed. Certify orchards before fruit is transported. Inspect citrus trees and fruit entering Australia in quarantine stations before transportation across Australia. Monitor citrus trees and fruit continuously. 7. 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? b c a d 8. 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 counting the number of people on the beach wearing hats and sunglasses By surveying beachgoers, asking if they remember the campaign By comparing skin cancer incidence before and after the campaign 9. Quarantine is ineffective as a measure to control non-infectious diseases because they cannot develop in isolation. may be inherited and affect the organism all their life. may only be treated by genetic engineering altering cells. depend on long-term exposure to a pathogen. 10. 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 natural selection. selective breeding. gene flow genetic drift 11. The diagram shows a model of the human eye d a c b 12. What is the purpose of cloning in agriculture? Preserving genetic variability in a population Increasing the frequency of recessive traits Preserving favourable traits in the offspring Increasing combinations of alleles in a population 13. A type of genetic technology is shown in the diagram What type of cloning is modelled? Whole organism cloning because identical offspring are produced. Whole organism cloning because the bacteria use asexual reproduction Gene cloning because bacteria are used. Gene cloning because a human gene is being replicated. 14. 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? Autosomal recessive Incomplete dominance Autosomal dominant Sex-linked 15. 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 proportionof the cells killed by the drugs (% toxicity) were recorded at different doses of each drugand shown in the graphs.From the results shown, which antiviral drug is the safest and most effective at a dose of1 µ mol L–1? d a b c 16. 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 made up of equal amounts of nitrogenous bases. DNA always has adenine paired with guanine DNA is always a double-stranded molecule 17. There are about 10 million single nucleotide polymorphisms (SNPs) found in the human genome. Four SNPs are modelled in the diagramThe SNPs modelled do not affect the phenotype of the individuals shown.Which is the best explanation for this? AGA, CAA, TAT and CTC all code for the same amino acid. The SNPs are part of DNA that is not expressed. The SNPs are present on one strand of the DNA molecule only. Only one nucleotide is different at each SNP. 18. 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 twoindividuals (who did not have SNPs in common).5. The pedigrees were constructed for the two individuals. D C B A 19. Which diagram correctly models one phase of meiosis in an organism that has six chromosomes in its somatic cells? D A B C 20. 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? C D A B Time is Up! Time's up Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)
