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For each of the following sentences, fill in the blanks with…

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; use each word or phrase only once. Microtubules are formed of tubulin [answer1]. Tubulin subunits are stacked together into protofilaments. Thirteen protofilaments form the [answer2] structure of a microtubule. The structures of the two ends of the microtubule are [answer3].  [answer4] ring complexes are important for microtubule nucleation and are concentrated in the [answer5]. A microtubule end that is quickly shrinking has a string of [answer6]- tubulins. The motor protein [answer7] generates the bending motion in cilia.

Rod photoreceptor cells are responsible for vision in dim li…

Rod photoreceptor cells are responsible for vision in dim light. The figure shows the pathway through which rod photoreceptor cell senses light. Predict whether the following mutations will result in a) night blindness (poor or no eye-sight in dim light)  b) prolonged response to a short light flash  Hint: The block of the activation pathway will result in night blindness.  The inhibition of the deactivation pathway will result in prolonged response to a short light flash. [answer1] Rhodopsin is inactive [answer2] guanylyl cyclase is inactive [answer3] Rhodopsin kinase is inactive [answer4] Regulator of G-protein signaling protein is inactive [answer5] The cGMP phosphodiesterase is inactive