A mutation in the HTT gene is associated with which disease?
A. breast cancer
B. diabetes
C. Huntington's disease
D. heart disease
E. ovarian cancer
C
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The chorion is produced from which primary tissue layer(s)?
a. ectoderm and endoderm b. ectoderm and mesoderm c. endoderm and mesoderm d. ectoderm only e. endoderm only
The term ‘coral bleaching' refers to:
a. the loss of a protistan symbiont by a reef-building coral b. the growth of new cnidarians within a reef c. the color change in coral reefs as they become mature d. an invasion of a coral reef by a colorless protistan as opposed to a green, photosynthetic one e. the loss of the calcium carbonate skeleton of cnidarian polyps
Which of these is false regarding atrazine?
a. It is an endocrine disruptor. b. It affects frog development and reproduction. c. Some exposed female tadpoles become masculinized. d. Some exposed male tadpoles become hermaphrodites. e. Some exposed male tadpoles develop feminized sex organs.
When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
A) relay molecule B) transducer C) signal molecule D) response molecule