In the following equation, lactose is a ________. galactose + glucose ? lactose + water
A) nucleic acid
B) fatty acid
C) disaccharide
D) dipeptide
C
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Transduction is defined as the:
a. change of the bacterial genotypes through the exchange of DNA from one cell to another. b. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. c. process by which genetic elements such as plasmids and transposons excise from one genomic location and insert into another. d. mechanism that is mediated by viruses, by which DNA from two bacteria may come together in one cell, thus allowing for re-combination.
A C4 plant minimizes photorespiration by
A. stomata that are only opened at night, storing carbon dioxide in malate, and releasing carbon dioxide during the day. B. having the light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco. C. having the light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco. D. stomata that are only opened at night, storing oxygen in malate, and releasing oxygen during the day.
A single seed lands on one of a group of isolated islands. Several million years later, its descendants have evolved into
a number of new species on the different islands, representing a variety of trees, shrubs, and vines. This is an example of ____.
a. adaptive radiation b. punctuated equilibrium c. genetic drift d. microevolution e. mutation
Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of
eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible? a. XX and XY b. XXY and XO c. XYY and XO d. XYY and YO e. XY and XO