What is unique about transduction compared to normal bacteriophage infection?
a. Transduction transfers DNA from the chromosome of one cell to another.
b. The bacteriophage does not erupt from an infected cell during transduction.
c. The bacteriophage takes fragments of the cell with it during transduction.
Answer: a. Transduction transfers DNA from the chromosome of one cell to another.
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Chromosomal rearrangements due to insertion sequences have apparently contributed to the evolution of several human pathogens
Indicate whether the statement is true or false.
How can the amebozoans, cercozoans, and radiolarians be distinguished from each other with microscopy if they all have pseudopodia?
A) Amebozoans have lobe-shaped pseudopodia, cercozoans and radiolarians both have threadlike pseudopodia, and radiolarians have radial symmetry. B) Amebozoans have lobe-shaped pseudopodia, and cercozoans are significantly smaller in size but contain threadlike pseudopodia just like radiolarians. C) Amebozoans have large pseudopodia, cercozoans have lobe-shaped pseudopodia, and radiolarians have radial threadlike pseudopodia. D) Amebozoans have multiple lobe-shaped pseudopodia, cercozoans have one or two threadlike pseudopodia, and radiolarians have multiple threadlike pseudopodia.
Why do scientists repeat their experiments over and over again?
a. They never get it right the first time. b. They can never be sure what procedural steps they followed the first few times. c. They must make sure the results were not an accident and that they are repeatable. d. They simply have extra time and resources that must be used.
Although covalent bonds are 10–100 times stronger than noncovalent interactions, many biological processes depend upon the number and type of noncovalent interactions between molecules
Which of the noncovalent interactions below will contribute most to the strong and specific binding of two molecules, such as a pair of proteins? (a) electrostatic attractions (b) hydrogen bonds (c) hydrophobic interactions (d) Van der Waals attractions