Enzymes used to cut genes in recombinant DNA research are known as ____
a. ligases
b. restriction enzymes
c. transcriptases
d. DNA polymerases
e. replicases
ANSWER: b
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In Addam's family, there is an autosomal dominant condition in which webbing attaches the second toe to the third toe and the second toe is longer than the big toe. Only some of the members who have inherited the mutant allele have a second toe longer than the big toe. In addition, the extent of webbing varies. This phenotype is
A) both inherited and non-inherited. B) dominant and recessive. C) variably expressive and incompletely penetrant. D) invariably expressive and completely penetrant.
Of the three plants measured in the figure, which requires water to allow sperm to swim to the egg?
A. shrubs
B. All of the plant groups rely on sperm swimming to the egg in water.
D. None of the plant groups relies on sperm swimming to the egg in water.
D. mosses
E. herbs
An energy pyramid is ____
a. a demonstration of the first law of thermodynamics b. a representation of the decline in available energy as it travels through the trophic levels c. fundamentally different from the pyramid of biomass and the pyramid of numbers d. a demonstration of the interactions between species in a community e. a representation of an ecosystem's diversity
A disorder is inherited by all the daughters of affected males, but by none of his sons. Heterozygous females are affected, and will pass on the trait to half their children, with boys and girls equally affected. What is the mode of inheritance of the trait?
1.autosomal dominant 2.sex-linked recessive 3.autosomal recessive 4.X-linked dominant 5.X-linked recessive 6.mitochondrial inheritance 7.Y-linked inheritance