The Following Steps Occur in Rods When They Are Excited

question 4

Multiple Choice

The following steps occur in rods when they are excited by photons of light. 1. Membrane sodium channels close.
2) Increased phosphodiesterase breaks down cGMP.
3) Retinal changes from the 11- cis form to the 11- trans form.
4) The membrane hyperpolarizes and the rate of neurotransmitter release declines.
5) Opsin activates transducin.
6) Opsin activation occurs.
The proper sequence for these steps is

• A) 1, 3, 4, 5, 6, 2.
• B) 1, 6, 5, 2, 4, 3.
• C) 3, 6, 5, 2, 1, 4.
• D) 3, 6, 5, 1, 2, 4.
• E) 6, 3, 5, 2, 1, 4.

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Definitions:

Ticks

Small arachnids, part of the order Ixodida, which are ectoparasites living by hematophagy on the blood of mammals, birds, and sometimes reptiles and amphibians, known for transmitting various diseases.

Commensalism

A relationship between two organisms where one benefits and the other is neither harmed nor benefited.

Predation

The interaction between two species where one organism, the predator, feeds on another organism, the prey, as a source of energy and nutrients.