Q1:
You have isolated a new crenarchaeotal strain from a hydrothermal vent 2000 meters below the surface of the ocean. This isolated strain can survive autoclaving and has an optimal growth temperature of 100°C (212°F) as long as it is grown in a pressurized chamber. It uses H2S as its electron donor and Fe(III) as its electron acceptor and does not need any source of organic carbon in order to grow.
Which of the following best describes this organism?
Group of answer choices
chemolithoautotroph, hyperthermophile, barophile
chemoheterotroph, thermophile, neutrophile
photoautotroph, hyperthermophile, barophile
chemolithoautotroph, thermophile, barophile
chemoheterotroph, hyperthermophile, neutrophile
Q2:
Pasteur showed that wine can be spoiled by ________ bacteria that ferment the sugars in grape juice to __________ .
Group of answer choices
aerobic / ethanol
aerobic / lactic acid
anaerobic / ethanol
anaerobic / lactic acid
Q3:
In many aquatic sediments that are regularly exposed to sunlight, layers of different types of photosynthetic bacteria grow and come together as a multi-layered microbial mat. The top layer of these mats is usually composed of cyanobacteria that show phototaxis towards _______ light. Underneath the top layer there are often red or purple layers of bacteria that contain organisms such as Rhodospirillum that show phototaxis towards _______ light.
Group of answer choices
visible / visible
infrared / infrared
infrared / visible
visible / infrared
Q4:
In many aquatic sediments that are regularly exposed to sunlight, layers of different types of photosynthetic bacteria grow and come together as a multi-layered microbial mat. The top layer of these mats is usually composed of cyanobacteria that show phototaxis towards _______ light. Underneath the top layer there are often red or purple layers of bacteria that contain organisms such as Rhodospirillum that show phototaxis towards _______ light.
Group of answer choices
visible / visible
infrared / infrared
infrared / visible
visible / infrared