The size range of most plant and animal cells is ________.
A) 1—10 nm
B) 1—5 ?m
C) 10—50 ?m
D) 0.1—0.5 mm
E) 50—100 mm
C) 10—50 ?m
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Suppose you are studying the nitrogen cycling in a pond ecosystem over the course of a month. While you are collecting data, a flock of one hundred Canada geese lands and spends the night during a fall migration
What could you do to eliminate error in your study as a result of this event? A) Find out how much nitrogen is consumed in plant material by a Canada goose over about a twelve-hour period, multiply this number by 100, and add that amount to the total nitrogen in the ecosystem. B) Find out how much nitrogen is eliminated by a Canada goose over about a twelve-hour period, multiply this number by 100, and subtract that amount from the total nitrogen in the ecosystem. C) Find out how much nitrogen is consumed and eliminated by a Canada goose over about a twelve-hour period and multiply this number by 100; enter this +/- value into the nitrogen budget of the ecosystem. D) Do nothing. The Canada geese visitation to the lake would have negligible impact on the nitrogen budget of the pond. E) Put a net over the pond so that no more migrating flocks can land on the pond and alter the nitrogen balance of the pond.
A chart that displays paired chromosomes in order of size is a
A) phenotype. B) genotype. C) karyotype. D) genome.
Following reports that the amount of DNA varied over time within cells, scientists in the early 1900s concluded that the genetic material had to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
Extinct glyptodont and living nine-banded armadillo were related according to Darwin. In what way are they related?
a. They were/are both living. b. They are both animals. c. Glyptodont is an ancestor and armadillo is a descendant. d. Glyptodont is a descendant and armadillo is an ancestor,