What does enzyme specificity mean?
A) Enzymes do not change or degrade after a reaction.
B) An enzyme is able to speed up several different chemical reactions
C) Enzymes can only bind to one type or shape of substrate .
D) Enzymes require a specific temperature and pH for optimum activity
Answer: C
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Chemical buffer systems
a. can act within a fraction of a second to buffer changes in [H+] b. are the only mechanism available for regulating changes in [H+] within the body c. actually remove acid from the body d. have characteristics a and c e. have none of the above characteristics
Intrapleural pressure exceeds airway pressure
a. during normal quiet breathing b. during maximal forced expiration c. in response to a pneumothorax d. during maximal forced expiration and in response to a pneumothorax e. in all of the above situations
By blocking the effect of acetylcholine at muscarinic but not nicotinic receptors, atropine is able to block parasympathetic effects while not influencing sympathetic activity at all
Indicate whether the statement is true or false
Which of the following statements is NOT true?
a. Taste and smell senses are highly variable in sensitivities among species. b. The intraspecies roles of olfaction are largely mediated by pheromones. c. Sensilla are specialized projections from the cuticle of insects and are involved in chemical sensing d. In humans, the cortical gustatory area is located in the temporal lobe. e. The modality for mammalian taste receptors is called a tastant.