The secretion of ____ is an important homeostatic mechanism involved in maintaining normal heart rhythm
a. hydrogen ions
b. potassium ions
c. water
d. glucose
e. urea
b
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Anabolic pathways of metabolism are pathways that ________________________
A. build complex molecules from simple ones B. release stored chemical energy C. take place primarily in skeletal muscle D. make large quantities of ATP
A nutritionist has an enclosed cabinet used to calculate the calories in foods. The protocol requires that the food is set on fire as fuel under a water tank and then the temperature change in the water is equated to the calorie content in the foods. High calorie foods burn better than low calorie foods. Why?
a. High calorie foods have less water than low calorie foods and water cools the heat transfer reaction during combustion. b. The third law of thermodynamics states that change of state reactions like combustion will result in decreased entropy. c. Burning the foods is an energy transformation. The second law of thermodynamics says that no energy transformation is 100% efficient. Some of the energy is usually lost to the surroundings as heat. d. The oxygen given off by high calorie foods is extremely combustible and that is what generates the heat. Foods that are burned have fewer calories after the protocol.
Which of the following is the correct sequence of hierarchical taxonomic categories?
A. species - family - genus - domain - order - phylum - class - kingdom B. domain - kingdom - phylum - class - order - family - genus - species C. species - genus - family - order - class - order - phylum - kingdom - domain D. kingdom - class - phylum - order - family - genus - species E. kingdom - class - domain - order - phylum - genus - family - species
What type of charge do histones tend to carry?
a. a mixture of positive and negative charges b. no charge c. a negative charge d. a positive charge