Indicate whether each of the following statements regarding skeletal muscle contraction is likely to be true or false.   After receiving a stimulating signal from a motor neuron, an action potential is generated and propagated across the plasma membrane of the muscle cell. This causes an influx of Ca2+ into the sarcoplasmic reticulum, triggering a muscle contraction. [1] When the cytoplasmic [Ca2+] increases, a change in the conformation of troponin leads to changes in tropomyosin such that it blocks the binding of myosin heads to the actin filament. [2] During muscle contraction, the Z discs move closer together as the myosin heads walk toward the minus ends of the actin filaments. [3] The T-tubule membrane in the muscle cell contains voltage-gated calcium channels. [4]

Indicate whether the following statements are true or false. An antibiotic that inhibits protein synthesis of a bacterium will likely inhibit protein synthesis in mitochondria. [1] The mitochondria are thought to have evolved by invagination and pinching off from the plasma membrane of an ancient eukaryotic cell. [2] Most mitochondrial proteins are translated in the cytosol. [3] Reovirus enters into the target cell by engaging with the surface receptor on the target cell, which in turns triggers the assembly of clathrin coat on the cytoplasmic side. [4] Reovirus is activated when an outer shell viral protein is attacked by an intestinal protease.[5] Per pumping cycle, the sodium-potassium antiporter transports one sodium ion into the cell and one potassium ion out of the cell. [6] The electrical potential of a charged molecule is not zero if the membrane potential is not zero.  [7]

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; each word or phrase should be used only once. There are several ways that membrane proteins can associate with the cell membrane.  Membrane proteins that extend through the lipid bilayer are called [1] proteins and have [2] regions that are exposed to the interior of the bilayer. Some other proteins are [3] attached to lipid molecules that are inserted in the membrane.  [4] membrane proteins are associated with the membrane through noncovalent interactions with other membrane-bound proteins. In animals, proteins constitute ~ [5] of the total mass of the plasma membrane. Transmembrane proteins that are destined for the plasma membrane are first inserted into the membrane of the [6]. 

For a cargo protein to be delivered to the nucleus, which of the following statements regarding its nuclear localization sequence is true?

In the textbox, compose your rough draft for Paragraph 2.  You should consult your outline (a printed copy) as you work on the paragraph. 

Find (fg)(x).​\(\style{font-family:Times New Roman}{f(x)=x^2,\;g(x)=\text{7}x-\text{7}}\)​

Select the correct graph of the given function.​\(\style{font-family:Times New Roman}{f(x)=\text{2}-x^{\text{2}}}\)​

Write an equation for the function that is described by the given characteristics.​The shape of \(\style{font-family:’Times New Roman’}{f(x)=x^2}\), but shifted six units to the right and two units downward.​

Select the graphs of f and f–1 on the same set of coordinate axes.​  f(x) = 2x – 3​

Find the domain of the function.​f(x) = 2×2 + 4x – 5​