Exam 2: Cell Physiology

Which of these statements describes why myelinated axons conduct impulses much faster than unmyelinated axons

In which cells are actin and myosin filaments commonly found

Match the terms, labelled a. through f., to their correct descriptions. (Options may be used more than once or not at all.) -separates contents of the cell from its surroundings

Which of the following is NOT part of the extracellular matrix

Which of these statements is an accurate representation of membrane permeability and ion potential

Under an electron microscope, the plasma membrane appears as a trilaminar structure consisting of two dark layers separated by a light middle layer.

Which of these statements describes the plasma membrane

Most intermediary metabolism is accomplished in the cytosol.

Net sodium movement into the cell occurs passively, whereas net sodium movement out of the cell occurs actively.

Which of the following is NOT a graded potential

Myelinated fibres conduct impulses about ____________________ times faster than unmyelinated fibres of the same diameter.

DNA's genetic code is transcribed into messenger RNA.

____________________, an enzyme found in peroxisomes, decomposes potentially toxic hydrogen peroxide.

Match the terms, labelled a. through i., to their descriptions. (Options may be used more than once or not at all.) -contains powerful oxidative enzymes important in detoxifying various wastes

Anions tend to move toward a negatively charged area.

Canadian researchers have suggested that the increased production of mucus in Cystic Fibrosis may be associated with the body's immune system.

In active transport, ATP energy is used in the phosphorylation-dephosphorylation cycle of the carrier.

Which of the following describes divergence

Which of these statements refers to the period of time following an action potential during which a membrane cannot be restimulated, no matter how strong the stimulus is

Michael is using the electron microscope at the hospital to review the structures of skeletal muscle cells.He notices that the skeletal muscle cells have many nuclei and are loaded with mitochondri a.Why is this so