Which evolutionary change was not one of the four primary milestones contributing to the evolution of the seed?
a. the proliferation of flagellated sperm
b. the emergence of sexually different spores
c. the protection of female spores and gametophytes within the body of the sporophyte
d. the trend toward reduced gametophytes
e. the evolution of the ovule
ANSWER: a
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Indicate whether the statement is true or false
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
Certain cell types in humans, such as skeletal muscle cells, have several nuclei per cell. Based on your
understanding of mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitosis with concomitant cytokinesis. c. The cell undergoes repeated mitosis but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
A type III survivorship curve is characteristic of:
a. monkeys b. horses c. eagles d. sea urchins e. humans