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Free Acellular Life MCQs with Answers

342 Acellular Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Viruses are acellular infectious particles whose capsid, nucleic acid and host-dependent replication distinguish them from living cells. HIV infection covers transmission, replication, effects on helper T cells, progression to AIDS, symptoms, prevention and treatment, while AIDS is the disease state caused by advanced immune-system damage rather than a separate virus.

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VirusesAIDS and HIV Infection
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342 questions · page 8 of 18

141. Select the wrong statement

  • A. The term 'contagium vivum fluidum' was coined by M. W. Beijerinck.
  • B. Mosaic disease in tobacco and AIDS in human beings are caused by viruses.
  • C. The viroids were discovered by D.J. Ivanovsky.
  • D. W. M. Stanley showed that viruses could be crystallized.

Explanation: 1. "The term 'contagium vivum fluidum' was coined by M. W. Beijerinck." - Correct.

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Correct answer: The viroids were discovered by D.J. Ivanovsky.

142. The replication of the HIV virus nucleic acid depends on what?

  • A. Replicase
  • B. Reverse transcriptase
  • C. Transcriptase
  • D. Reverse replicase

Explanation: This is because HIV is a retrovirus with an RNA genome. After entering the host cell, HIV uses reverse transcriptase to convert its…

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Correct answer: Reverse transcriptase

143. A person with a viral load of HIV-1, if untreated, leads to:

  • A. Cancer
  • B. Hepatitis
  • C. Jaundice
  • D. AIDS

Explanation: Option D is incorrect, as if a person with HIV-1 is untreated, the virus can eventually destroy the immune system. This is called AIDS.

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Correct answer: AIDS

144. Nowadays every newborn gets regular shots of vaccine for polio. It contains _ for polio to make a child immune against this disease.

  • A. Antibiotics
  • B. Antibodies
  • C. Antigens
  • D. Antisera

Explanation: A vaccine elicits an immune response by the host so that the host is better equipped to fight against the invading organism, in any…

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Correct answer: Antigens

145. Each sentence below has a blank indicating that something has been omitted. Choose the word that best fits in with the meaning of the sentence as a whole.Mani suffered one final ignominy after death when his tomb was _.

  • A. Consecrated
  • B. Secured
  • C. Vitalized
  • D. Desecrated

Explanation: An "ignominy" is shame, disgrace, or humiliation, so because he suffered one final "ignominy" after death, we can infer that his tomb must…

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Correct answer: Desecrated

146. Spot the error. It is time we decided who side we are on, the University of Bath or the people of Swindon.

  • A. decided
  • B. who
  • C. on
  • D. the

Explanation: The error in the sentence is in option (B) "who." It should be corrected to "which" to correctly refer to the choice between sides in the…

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Correct answer: who

147. CHOOSE THE CORRECT OPTIONS.

  • A. A more unjust the king is, a more troubled his country will be.
  • B. The more unjust the king is, the more troubled his country will be.
  • C. More unjust the king is, more troubled his country will be.
  • D. The more unjust king is, more troubled his country will be.

Explanation: This sentence is grammatically correct and idiomatic. It uses the correct correlative conjunctions "the more...

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Correct answer: The more unjust the king is, the more troubled his country will be.

148. There --- many difficulties regarding the situation.

  • A. should
  • B. was
  • C. were
  • D. is

Explanation: The correct answer is 'were' because it matches the plural subject 'difficulties.' The sentence 'There were many difficulties regarding…

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Correct answer: were

149. Spot the error.The couples have been so close that they even lived next door to each other themselves for a while.

  • A. Have been
  • B. Even
  • C. Each
  • D. Themselves

Explanation: The correct answer is Themselves because in this context, the reflexive pronoun 'themselves' is unnecessary.

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Correct answer: Themselves

150. In this section of logical deduction, the question consists of a brief passage (usually a report containing certain data regarding some social or economic problem), followed by certain inferences based on it. The student is required to analyze the contents (or data) of the passage and grasp the desirable facts from it. Then, student has to consider each of the given inferences in the context of the given passage. decide upon its degree of truth or falsity and then choose the hest alternative provided accordingly.A radical new surgery procedure, laughed at not long ago, is holding out fresh hope for patients of cardiac myopathy, or enlargement of the heart. The technique, now in Pakistan, allows patients to go home two weeks after the Operation, to lead a near-normal sedentary life. Cardiac myopathy is a condition that has a variety of causative factors. An attack from one of the 20 identified viruses, parasite infection, long-term alcohol abuse and blood pressure could bring it on, and in rare cases, it could follow child birth and is even known to run in families. The condition is marked by an increase in the size of the heart's chambers and a decrease in the efficiency of pumping.Cardiac myopathy is hereditary.

  • A. Definitely true
  • B. Probably true
  • C. Data inadequate
  • D. Probably false
  • E. Definitely false

Explanation: The correct answer is 'Probably true' because the passage states that cardiac myopathy is 'even known to run in families,' suggesting a…

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Correct answer: Probably true

151. Find the missing term in the sequence: 87, 102, 119, 138, 159, ?

  • A. 184
  • B. 180
  • C. 182
  • D. 185

Explanation: The difference between consecutive terms is a sequence of increasing odd numbers: +15, +17, +19, +21. The next difference should be +23.

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Correct answer: 182

152. Passage: A, P, R, X, S and Z are sitting in a row. S and Z are in the centre, and A and P are at the ends. R is sitting on the left of A. Then who is sitting on the right of P?

  • A. A
  • B. S
  • C. X
  • D. Z

Explanation: The statement "R is sitting on the left of A" establishes the orientation.

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Correct answer: X

153. In the following question, two statements numbered I and II are given. There may be cause and effect relationship between the two statements. These two statements may be the effect of the same cause or independent causes. These statements may be independent causes without saving any relationship. Read both the statements in question and mark your answer as:A. If statement I is the cause and statement II is its effect;B. If statement II is the cause and statement, I is its effect;C. If both the statements I and II are independent causes;D. If both the statements I and II are effects of independent causes;E. If both the statements I and II are effects of some common causes;I. The fanners have decided against selling their kharif crops to the Government agencies.II. The Government has reduced the procurement price of kharif crops starting from last month to the next six months.

  • A. A. If statement I is the cause and statement II is its effect;
  • B. B. If statement II is the cause and statement I is its effect;
  • C. C. If both the statements I and II are independent causes;
  • D. D. If both the statements I and II are effects of independent causes;
  • E. E. If both the statements I and II are effects of some common cause;

Explanation: Statement II describes a governmental action of reducing procurement prices for kharif crops, which could naturally lead to Statement I…

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Correct answer: B. If statement II is the cause and statement I is its effect;

154. In this question, a statement is given followed by two courses of action numbered I and II. It is required to grasp the statement, analyze the problem or policy it mentions and then decide which of the courses of action logically follow / most appropriate.Statement:A large number of people die every year due to drinking polluted water during the summer.Courses of action:I) The government should make adequate arrangements to provide safe drinking water to all its citizens.II) The people should be educated about the dangers of drinking polluted water.

  • A. If only I follows
  • B. If only II follows
  • C. If either I or II follows
  • D. If neither I nor II follows
  • E. If both I and II follow

Explanation: The correct answer is Option E: If both I and II follow. Providing safe drinking water (Course I) is a direct solution to the problem…

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Correct answer: If both I and II follow

155. Which of the following is derived from the host by HIV?

  • A. Envelope
  • B. RNA
  • C. Reverse Transcriptase
  • D. All of these

Explanation: The envelope of a virus is derived from the host cell's membrane during the process of viral budding.

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Correct answer: Envelope

156. Which event of the life cycle of HIV occurs in the nucleus

  • A. Uncoating
  • B. Reverse Transcription
  • C. Provirus Integration
  • D. Assembly

Explanation: The provirus is the integrated viral DNA in the host cell genome, and its formation involves the reverse transcription process in the…

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Correct answer: Provirus Integration

157. Prions are infectious proteins known to cause

  • A. Athlete's foot
  • B. Herpes simplex
  • C. Mad cow disease
  • D. Mumps and Measles

Explanation: Prions are misfolded proteins that can cause neurodegenerative diseases. They are infectious particles solely composed of proteins.

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Correct answer: Mad cow disease

158. The given diagram shows different stages of lysogenic cycle of a temperate bacteriophage

  • A. I only
  • B. III only.
  • C. I and II
  • D. II and III

Explanation: Induction is the process where the prophage is activated and excises itself from the host chromosome, initiating the lytic cycle.

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Correct answer: III only.

159. In humans, Creutzfeldt-Jakob disease (CJD) is caused by

  • A. Prions
  • B. Viroid
  • C. Retrovirus
  • D. Bacteriophage

Explanation: Creutzfeldt-Jakob disease (CJD) in humans is caused by prions, which are infectious proteins.

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Correct answer: Prions

160. During the lytic cycle, the function of lysozymes released by phage is to

  • A. Synthesise viral genome
  • B. Dissolve bacterial cell wall
  • C. Break down bacterial DNA
  • D. Speed up the formation of proteins

Explanation: In the lytic cycle, the correct function of lysozymes is to dissolve the bacterial cell wall, which allows the newly formed phage…

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Correct answer: Dissolve bacterial cell wall
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