Which of the following conditions will most favor the growth of microbes?
A. waterlogged with little mineral content
B. moderately moist soil with lots of organic compounds
C. alternating moist and dry with alkaline conditions
D. mostly dry soil with moderate amounts of organic compounds and acidic conditions
E. alternating moist and dry soil with high salt content
Answer: B
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Parts of the choroid form
(a) the lens. (b) the ciliary body. (c) the iris. (d) both b and c.
Matching II. Choose the most appropriate answer
1. ___ autonomic nervous system 2. ___ frontal lobe 3. ___ cerebellum 4. ___ corpus callosum 5. ___ ganglion 6. ___ hypothalamus 7. ___ limbic system 8. ___ medulla oblongata 9. ___ midbrain 10. ___ nerve net 11. ___ peripheral nervous system 12. ___ reticular formation 13. ___ meninges 14. ___ neurotransmitter molecule 15. ___ white matter A. integrates body position, motions, balance B. in cnidarians; based on reflex pathways devoted to swimming and feeding C. messages from here arouse the brain and maintain wakefulness D. the cortical region that coordinates muscles required for speech E. all parts of nerve cells outside the brain and spinal cord F. acetylcholine is an example G. reflex control center for breathing, heart rate, and blood pressure H. axons of the central nervous system that are sheathed with fatty myelin I. at top of the brainstem bordering the cerebral hemispheres; influences learning and emotional behavior J. motor neurons that are divided into sympathetic and parasympathetic divisions K. membrane coverings over brain spinal cord L. contains the tectum; receives and integrates sensory information that is largely sent on to the forebrain for further neural processing M. connects right and left cerebral hemispheres N. group of nerve cell bodies that form an integrative center O. contains centers concerned with body temperature regulation and with salt and water balance
Which of the following systems does NOT dispose
of a type of waste directly to the environment? a. digestive b. respiratory c. integumentary d. circulatory e. urinary
Which statement about Down syndrome is correct?
A) Down syndrome is caused by a third copy of chromosome 21. B) Down syndrome is usually associated with chromosomal nondisjunction in meiosis. C) Characteristics of Down syndrome include stubby fingers and a palm crease. D) Individuals affected with Down syndrome display mental impairment. E) All of the answer choices are correct about Down syndrome.