A relationship which benefits flow both ways

between the interacting species is



a. a neutral relationship.
b. commensalism.
c. competition.
d. mutualism.
e. parasitism


D

Biology & Microbiology

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Agrobacterium has the ability to infect plants and produce tumor-like growths.

Answer the following statement true (T) or false (F)

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The result obtained in Jacob and Monod's merodiploid analysis that suggested the lacO region acts in cis to regulate the lac operon was:

A. a nonfunctional lacI mutant is rescued by a wild-type lacI allele. B. a nonfunctional lacI mutant cannot be rescued by a wild-type lacI allele. C. a nonfunctional lacO mutant is rescued by a wild-type lacO allele. D. a nonfunctional lacO mutant cannot be rescued by a wild-type lacO allele.

Biology & Microbiology

Which two scientists proposed the unified cell theory?

a. Watson and Crick b. van Leeuwenhoek and Virchow c. Schleiden and Schwann d. Hooke and Pasteur

Biology & Microbiology

Which of the following designates a normal human male?

a. YY b. XX c. XY d. XO e. XYY

Biology & Microbiology