Which ion accumulates in the outer mitochondrial membrane compartment during electron transport chain reactions?
calciumcalcium
a. hydrogen
b. oxygen
c. sodium
d. potassium
e. calcium
ANSWER: a
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Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is not a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. Overactive troponin molecules B. Acetylcholine receptors that function in the absence of acetylcholine C. Tropomyosin that is unable to bind to actin D. Leaky Na+ channels E. Overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum
A hominid of Europe and Asia that became extinct
nearly 30,000 years ago was a. a dryopith. b. Australopithecus. c. Homo erectus. d. Homo neanderthalensis e. Homo floresiensis.
An element is
a. a pure substance that can be broken down to another substance. d. an atom with an unstable nucleus. b. a pure substance that cannot be broken down to another substance. e. an atom with positive electrons. c. the smallest unit that has properties of a given element.
The trace amounts of micronutrients needed by microorganisms are usually supplied as inadvertent contaminants in water and regular media components.
Answer the following statement true (T) or false (F)