The simplest hypothesis for the original function of Hox genes is that the common ancestor of bilateral animals had Hox genes that were ________
A) expressed in the development of its appendages
B) scattered throughout the genome
C) expressed in the canonical spatial pattern
D) crucial for the development of its digestive system
E) organized in multiple clusters
C
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Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria
A) are very sensitive to UV irradiation, despite their reliance on light for energy. B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis. C) are strict anaerobes. D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low.
Which scientist is credited with coining the term cell from the Latin cellulae?
A) Robert Brown B) Antonie van Leeuwenhoek C) Theodor Schwann D) Matthias Schleiden E) Robert Hooke
African sleeping sickness is caused by Trypanosoma brucei, a unicellular flagellated protist infects red blood cells after being injected into the blood stream. African sleeping sickness is transmitted by:
a. Ingesting food b. Contaminated water c. Sexual intercourse d. The bite of an insect e. Exhaled aerosols
Birds and insects both have wings, but we do not consider this similarity as evidence of relatedness because
A. they did not evolve in the same region or live at the same time period. B. the wings are not homologous structures with a common ancestral origin. C. bird wings, but not insect wings, function on the physics principles of lift. D. there is no fossil link between these groups. E. insect wings are vestigial.