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State PSC Science & Technology — practice questions — page 10

Explore 311 free Science & Technology questions in State PSC Science. Open each question or exercise to read its content, reference answers and available explanation.

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Science & Technology questions and exercises with answers

Showing questions 271–300 of 311.

Viruses that infect plants generally have which genetic material?Read the answer and worked solution →Viroids, discovered by T.O. Diener in 1971, differ from viruses in lacking a:Read the answer and worked solution →Mad cow disease is caused by an infectious agent made of abnormally folded protein called a:Read the answer and worked solution →Catch the protistsRead the answer and worked solution →Pop the fungiRead the answer and worked solution →Run the virus discoveriesRead the answer and worked solution →Slice the classification wordsRead the answer and worked solution →Prokaryote or eukaryoteRead the answer and worked solution →Sort the kingdomsRead the answer and worked solution →Type the numberRead the answer and worked solution →Biological classification bingoRead the answer and worked solution →Health is a state of being well enough to function well physically, mentally and:Read the answer and worked solution →Because stagnant drain water and garbage raise the risk of poor health, what is important for individual health?Read the answer and worked solution →Literally, the word disease means:Read the answer and worked solution →Diseases lasting only a very short time, like the common cold, are:Read the answer and worked solution →Elephantiasis, which can last a lifetime, is an example of a:Read the answer and worked solution →A baby gets loose motions from unclean water while being poorly nourished and poor. Poor nourishment here is a:Read the answer and worked solution →Diseases where microbes are the immediate cause and can spread in a community are:Read the answer and worked solution →High blood pressure caused by excess weight and lack of exercise is an example of a:Read the answer and worked solution →Which bacterium was found by Warren and Marshall to cause peptic ulcers?Read the answer and worked solution →Robin Warren and Barry Marshall, who linked a bacterium to peptic ulcers, were from:Read the answer and worked solution →Common cold, influenza, dengue fever and AIDS are caused by:Read the answer and worked solution →Kala-azar is caused by which protozoan?Read the answer and worked solution →Staphylococci are bacteria that can cause:Read the answer and worked solution →Penicillin kills bacteria by blocking the processes that build their:Read the answer and worked solution →Antibiotics do not work against viral infections because viruses:Read the answer and worked solution →Animals like mosquitoes that carry infecting agents from a sick person to another host are:Read the answer and worked solution →Female mosquitoes bite because they need blood to:Read the answer and worked solution →Typhoid-causing bacteria entering through the mouth stay in the:Read the answer and worked solution →The virus causing Japanese encephalitis, entering through a mosquito bite, infects the:Read the answer and worked solution →

Worked practice questions

Viruses that infect plants generally have which genetic material?

  1. Only proteins
  2. Single stranded RNA
  3. Double stranded DNA
  4. Both RNA and DNA
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Correct answer: B. Single stranded RNA

1. No virus contains both RNA and DNA. 2. Plant viruses have single stranded RNA. 3. Bacteriophages are usually double stranded DNA. _Source: syllabus Biology, Chapter 2, Biological Classification._

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Viroids, discovered by T.O. Diener in 1971, differ from viruses in lacking a:

  1. Cell wall
  2. Flagellum
  3. Protein coat
  4. Nucleic acid
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Correct answer: C. Protein coat

1. They cause potato spindle tuber disease. 2. A viroid is free RNA without a protein coat. 3. Its RNA has low molecular weight. _Source: syllabus Biology, Chapter 2, Biological Classification._

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Mad cow disease is caused by an infectious agent made of abnormally folded protein called a:

  1. Viroid
  2. Virus
  3. Lichen
  4. Prion
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Correct answer: D. Prion

1. It is similar in size to a virus. 2. Prions are misfolded proteins. 3. The human variant is CJD. _Source: syllabus Biology, Chapter 2, Biological Classification._

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