The filamentous growths of moss gametophytes that produce numerous leafy shoots from buds are called ____
a. rhizoids
b. thalli
c. sporophytes
d. zygotes
e. protonema
ANSWER: e
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Which reefs are directly impacted by human activity the most?
a. Barrier reefs b. Fringing reefs c. Patch reefs d. Atolls
The first plants evolved rapidly during the __________ period
a. Devonian b. Silurian c. Carboniferous d. Triassic e. Ordovician
During meiosis, a defect occurs in a cell that results in the failure of microtubules, spindle fibers, to bind at the kinetochores, a protein structure on chromatids where the spindle fibers attach during cell division to pull sister chromatids apart
. Which of the following is the most likely result of such a defect? A) New microtubules with more effective binding capabilities to kinetochores will be synthesized to compensate for the defect. B) Excessive cell divisions will occur resulting in cancerous tumors and an increase in the chromosome numbers known as polyploidy. C) The defect will be bypassed in order to and ensure normal chromosome distribution in the new cells. D) The resulting cells will not receive the correct number of chromosomes in the gametes, a condition known as aneuploidy.
Plant species regularly hybridize in nature, but only some crosses result in new polyploid species. Of the crosses below, if each one occurred, which would be most likely to result in a new stable polyploid species?
A. A cross between a species with a CC genome and a species with a DD genome, forming a hybrid with a CD genome. B. A cross between a species with a BB genome and a species with a DD genome, followed by a doubling of chromosomes, forming a hybrid with a BBDD genome. C. A cross between a 4n gamete and a 1n gamete, forming a 5n hybrid. D. A cross between a 2n gamete and a 1n gamete, forming a 3n hybrid.