Low levels of the neurotransmitter dopamine can lessen the ability to focus effectively on tasks. However, high levels of dopamine can result in feelings of motivation. How would you classify dopamine and why?
A) Dopamine is excitatory because it enhances motivation levels.
B) Dopamine is inhibitory because it diminishes the ability to focus.
C) Dopamine is both inhibitory and excitatory because it can enhance motivation levels but diminish the ability to focus.
Answer: C
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Answer the following statements true (T) or false (F)
1. The fast block to polyspermy occurs through a rapid increase in cytosolic calcium within the egg. 2. The sperm and its DNA enters the egg through simple diffusion through the egg plasma membrane. 3. The cortical reaction prevents multiple sperm from contributing their chromosomes to the egg. 4. The endoderm is a germ cell layer that tends to cover the embryo.
Sympatric speciation occurred in the cichlid fishes within the same lake in Africa. How could this occur without physical separation?
What will be an ideal response?
Crossing over is one of the most important events in
meiosis because a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. all of these reasons are true.
Which current method allows for classification of
both cultivable and non-cultivable prokaryotes? a. isolation and observation b. protein analysis c. lipid analysis d. DNA sequencing e. none of these