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
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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)
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.
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
Which of the following designates a normal human male?
a. YY b. XX c. XY d. XO e. XYY