During the S period of interphase
(a) cell growth takes place.
(b) nothing occurs because this is a resting period.
(c) chromosomes divide.
(d) synthesis (or replication) of the nucleoproteins takes place.
(d) synthesis (or replication) of the nucleoproteins takes place.
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Which are important aspects of a complementation test done by coinfection of bacterial cells with phage T4? (Select all that apply.)
A) using sufficient amounts of two phage strains, each with different mutations B) infecting bacteria with two phage strains that have recessive mutations C) counting the number of plaques that are produced after infection of E. coli K(?) cells D) recovering phage from the plaques after growth and lysis
Altricial young are relatively
A) independent at birth and require relatively little time for incubation and gestation. B) independent at birth and require a relatively long time for incubation and gestation. C) helpless at birth and require relatively little time for incubation and gestation. D) helpless at birth and require a relatively long time for incubation and gestation.
One result of Costa Rica's commitment to conservation is that
A) destructive practices such as massive logging and large-scale single-crop agriculture have been nearly eliminated. B) both protected park areas and the buffer zones around them have suffered only negligible deforestation. C) ecotourism generates many jobs and brings in a significant fraction of the country's revenue. D) about 95% of the country's land is protected in some way.
The goal of cellular respiration is the synthesis of
a. glucose. b. enzymes. c. DNA. d. ATP.