Spindle fibers attach to the ____ of a chromosome during cell division
a. centromere
b. telomere
c. cell membrane
d. short arms
e. gametes
a
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For most terrestrial ecosystems, pyramids composed of species abundances, biomass, and energy are similar in that they have a broad base and a narrow top. The primary reason for this pattern is that _____
A) secondary consumers and top carnivores require less energy than producers B) at each step, energy is lost from the system C) as matter passes through ecosystems, some of it is lost to the environment D) biomagnification of toxic materials limits the secondary consumers and top carnivores E) top carnivores and secondary consumers have a more general diet than primary producers
Unlike the 16S rRNA gene phylogenetics used to identify relatedness in Bacteria, the 18S rRNA gene is by itself unreliable for phylogeny of members in Eukarya
Indicate whether the statement is true or false.
In which order were the key features of complex multicellularity likely to have appeared?
A. cell adhesion, cell communication, regulated growth and development B. cell communication, cell adhesion, regulated growth and development C. regulated growth and development, cell communication, cell adhesion D. regulated growth and development, cell adhesion, cell communication
The transition zone between biomes is called a(n) ecotone. Indicate whether the statement is true or false