Which of the following statements is true?
(a) The mitotic spindle is largely made of intermediate filaments.
(b) The contractile ring is made largely of microtubules and actin filaments.
(c) The contractile ring divides the nucleus in two.
(d) The mitotic spindle helps segregate the chromosomes to the two daughter cells.
(d)
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Which of the following statements does not accurately describe the navigational ability of homing in birds?
A. Homing pigeons have map sense, which most likely includes landmarks as well as olfactory and visual cues. B. Homing pigeons use the sun and stars as well as the magnetic field to find their way "home" over long distances. C. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day. D. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day, but it would be able to navigate on a sunny day because it would still be able to use the sun as a compass. E. A biological clock used for time cues is not necessary for a homing pigeon to use the sun compass.
When species diversity is calculated, what is being measured?
A. Species number. B. The evapotranspiration rate. C. Both species number and relative abundance. D. The resistance of a community to disturbance. E. The process of inhibition.
Influenza virus can exhibit constant mutation of viral glycoproteins, called antigenic ________, or alternatively antigenic ________, which is a more serious phenomenon caused by the exchange of a viral gene with that of another influenza virus strain.
A. drift; exchange B. exchange; drift C. shift; drift D. drift; shift
A population is all of the individuals of a given species in the same place at the same time
1.True 2.False