Most cells are small. When they reach a certain size, cells typically divide. This has to do with the
a. amount of genetic material.
b. surface-to-volume ratio.
c. inability to produce more components of the cell membrane.
d. fact that they cannot possess sufficient numbers of organelles for normal cell functioning.
e. differences between viral particles and eukaryotic cells.
B
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Which of the following is a diploid stage in the
life cycle of fungi?
a. zygote b. spores c. gametes d. vegetative growth of hyphae e. cell reproduction by budding or fragmentation
In early human embryos, the gene HoxB7 is involved in patterning the central nervous system. In later embryos, HoxB7 plays a critical role in growth and development of the kidney
These different functions of the same gene at different times and places are an example of ________. A) homology B) taphonomy C) pleiotropy D) unconformity E) constraint
Oxygen-rich blood flows through the heart
A) by entering the right atrium and continuing through the aortic arch. B) via the left atrium and ventricle before entering the systemic circuit. C) on the left side of the heart following returning from the lungs via the pulmonary arteries. D) right to left. E) only through the coronary arteries.
Which theory states that eukaryotic organelles originated as prokaryotes that survived ingestion by a host cell and
ultimately evolved mutualistic relationships with the host cell? a. endosymbiont theory b. heterosymbiont theory c. obligative symbiotic theory d. facultative symbiotic theory e. autotrophic symbiotic theory