Which statement is true about obligate anaerobes? view available hint(s) which statement is true about obligate anaerobes? they obtain energy by oxidizing ferrous ions. they will use o2 if it is present, but may obtain energy by fermentation if needed. they use o2 for cellular respiration and cannot grow without it. they are poisoned by o2. they live exclusively by cellular respiration or by anaerobic respiration.

They are poisoned by O₂

Explanation:

Obligate anaerobes cannot survive in normal concentrations of oxygen. Depending on the species, tolerance varies from 0.5% to 8% oxygen.

Under normal cellular conditions, O₂ turns into O₂⁻ and H₂O₂, toxic to the organism. Obligate anaerobes lack enzymes superoxide dismutase and catalase, capable of turning O₂⁻ and H₂O₂ back into breathable O₂.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .