#Question id: 11122
#Unit 9. Diversity of Life Forms
Phylogenetic hypotheses (such as those represented by phylogenetic trees) are strongest when
#Question id: 11123
#Unit 9. Diversity of Life Forms
Cladograms (a type of phylogenetic tree) constructed from evidence from molecular systematics are based on similarities in
#Question id: 11124
#Unit 9. Diversity of Life Forms
A researcher compared the nucleotide sequences of a homologous gene from five different species of mammals with the homologous human gene. The sequence homology between each speciesʹ version of the gene and the human gene is presented as a percentage of similarity.
What probably explains the inclusion of rabbits in this research?
#Question id: 11125
#Unit 7. System Physiology – Animal
In chemical synapses that involve a so-called second messenger, typically a G-protein linked to the postsynaptic receptor is activated when neurotransmitter binds to that receptor. Which of the following represents an activity performed by the activated second messenger?
#Question id: 11126
#Unit 7. System Physiology – Animal
Which of the following is characteristic of the events occurring at an excitatory synapse?
#Question id: 11127
#Unit 7. System Physiology – Animal
As the receptor potential rises higher above threshold, which of the following best characterizes the new frequency of action potentials?