The muscle subtype represented by Culture C is LEAST likely to be characterized by: a fast rate of muscle contraction. the ability to engage in oxidative and anaerobic respiration. the presence of medium-sized motor units. low densities of mitochondria and capillaries.

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low densities of mitochondria and capillaries

Explanation:

Culture B has high mitochondrial and capillary density which indicates the presence of aerobic activity since oxidative phosphorylation occurs in mitochondria and also capillaries supply oxygen to the cells facilitating the process. Out of the given skeletal muscle fibers, fiber I shows high oxidative capacity and aerobic activity hence culture B has muscle fiber I cells.

Culture A produces lactic acid on stimulation which is a byproduct of anaerobic respiration. According to the table, both fiber IIA and IIX show anaerobic activity. However in culture A the pH dropped drastically in just two minutes which proves that a lot of lactic acid was produced in short amount of time. Fiber IIX produces higher power than fiber IIA and is used for shorter period of time. Hence, culture A has muscle fiber IIX cells.

Hence, the researcher could finally identify culture C as type IIA muscle fiber. Type II fiber cells though involved in long term anaerobic activity, also show high oxidative capacity. Thus, they should have high or near high mitochondria and capillary density. So, culture C is least likely to be characterized by low mitochondria and capillary density.

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.