Which one of the following statements about viruses is incorrect?
A. Most viruses use cellular machinery to replicate their genetic material.
B. The genomes of viruses are enclosed in a protein coat and occasionally a lipid bilayer envelope.
C. Viruses possess the ability to harness energy from the environment.
D. Viruses are valuable tools in biological research.
E. Some types of viruses employ replicative cycles involving the integration of their genomes into the genome of the host organism.
Answer: C
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The process by which a nontoxigenic Corynebacterium diphtheriae cell is changed into a toxigenic cell is called:
A) conjugation. B) lysogenic conversion. C) transduction. D) transformation.
The theory of evolution addresses which of the following?
a. How populations change b. The origin of life c. The spiritual world d. How individuals develop
Which of the following helps to determine the time it takes to empty the stomach?
a. fat content b. acidity of chyme c. both fat content and acidity of chyme d. pepsin concentration e. gastrin concentration
Allergy testing, which is accomplished by injecting tiny amounts of allergen into the skin and examining the injection site for a reaction, is an example of an in vitro test.
Indicate whether the statement is true or false.