Habitat changes for cichlids living in Lake Victoria are causing a change in:
a. mate choice.
b. species diversity.
c. coloration of male cichlids.
d. frequency of hybrids.
e. All of these
E
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Which of the following features distinguishes all hormones from neurotransmitters?
A. Hormones require large concentrations to have an effect, while neurotransmitters require only low concentrations. B. A hormone affects reproductive functions, while neurotransmitters control all other processes. C. Hormones travel via the blood to a target tissue, while neurotransmitters cross the synaptic cleft to a postsynaptic cell. D. Hormones are steroids, while neurotransmitters are amino acids.
When the left ventricle contracts, blood moves into the:
a. aorta b. pulmonary artery c. left atrium d. superior vena cava e. pulmonary circuit
Glycogen is a polysaccharide used for energy
storage by a. animals. b. plants. c. protistans. d. bacteria. e. fungi.
Which of the following is the most notable symptom of infection with Norovirus?
A. Fever B. Constipation C. Headache D. Vomiting E. Skin rash