The fungal-plant root combination is referred to as
a. mycorrhizae.
b. symbiosis.
c. hyphae.
d. mycelia.
e. lichen.
A
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Despite dramatic differences in appearance, size, and behavior, you are surprised to find that two organisms you have been studying are able to reproduce successfully, and produce fertile offspring. Which of these choices is the largest taxonomic category that these two organisms share in common?
a. subspecies b. species c. family d. genus
The two strands of a DNA molecule contain nitrogen bases which are
A. identical. B. parallel. C. complementary. D. proportionate. E. random.
Endosymbiosis is an evolutionary theory that explains the origin of eukaryotes and suggests a specific order in which this might have occurred. Ancestral cells engulfed and then began to use the metabolic processes of the smaller cells
Based on shared core processes and features, which statement most accurately describes the order, the theory and the evolutionary implications for all organisms within domain Eukarya? A) Ancestral heterotrophic eukaryotes most likely engulfed both a heterotrophic and an autotrophic prokaryote, whereas ancestral photosynthetic eukaryotes probably provided the host cell for the first mitochondria. Over time, natural selection favored these relationships and these cells became ancestors of all eukaryotes. B) All ancestral eukaryotes would have most likely consumed a nucleus-like prokaryote that eventually became the eukaryotic nucleus. These new eukaryotic cells would have had an advantage over prokaryotic cells by acquiring a nuclear command center for regulating cellular activities. C) As carbon dioxide levels were increasing over time, natural selection would have favored organisms that acquired a photosynthetic prokaryote to convert carbon dioxide into sugars. These would have likely been the first eukaryotic cells. At which point, these ancestral cells engulfed mitochondria-like prokaryotes that would have provided an even greater advantage for cells in this environment. D) As Earth was becoming more aerobic, mitochondria would have provided an advantage to host cells by converting "toxic" oxygen into energy for heterotrophic cells. Since mitochondria are found in all eukaryotes, these combinations likely evolved first. Photosynthetic eukaryotes probably acquired an autotrophic prokaryote, which developed an advantageous symbiotic relationship with the host cell.
A couple, both carriers of cystic fibrosis (CF) alleles, can decrease their odds of having a child with CF by performing an in vitro fertilization procedure and screening the embryo for the CF alleles. This process is called
A. polymerase chain reaction. B. gene therapy. C. genetic typing. D. preimplantation genetic diagnosis. E. cloning and testing the unborn child.