In the Hershey-Chase experiment,
a. DNA from parent bacteriophages appeared in progeny bacteriophages.
b. most of the phage DNA never entered the bacteria.
c. more than three-fourths of the phage protein appeared in progeny phages.
d. DNA was labeled with radioactive sulfur.
e. DNA formed the coat of the bacteriophages.
Answer: a. DNA from parent bacteriophages appeared in progeny bacteriophages.
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Based on your understanding of metabolism, generalize when an enzyme's rate of activity can be changed
A) before enzyme production B) during enzyme production C) after enzyme production D) at any point-before, during, or after enzyme production
What occurs during leptotene of prophase I?
A. The homologous chromosomes recognize one another by synapsis. B. Crossing over occurs. C. The replicated chromosomes condense. D. The synaptonemal complex dissociates. E. None of the answers are correct.
Community ecology is best defined as the study of
A. how groups of species interact in the same place at the same time. B. mutual benefits between organisms at all scales in a region. C. plant distributions in a given region. D. global scale influences of major disturbances such as volcanoes. E. the relationship between abiotic and biotic factors.
Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island. B. each bird species evolved different adaptations in allopatry and then colonized the other islands. C. one bird species colonized each island and then evolved into distinct species on that island through character displacement. D. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations.