The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "C"?
A. Major site of ATP synthesis when oxygen is available
B. Site of protein synthesis
C. Directs cellular activities, contains DNA
D. Contains digestive enzymes
E. Outer boundary of cell, controls entry and exit of substances
Answer: B
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A. motor B. cranial C. ganglial D. efferent E. sensory
Which eye feature provides vitamin A for photoreceptor cells?
A. Cornea B. Conjunctiva C. Sclera D. Pigmented layer of the retina E. Neural layer of the retina
How can you explain the substantial lag between a signal and response in the phylum Porifera?
A) Lag occurs because sponges are asymmetrical. B) Lag occurs because sponges show no cephalization. C) Lag occurs because action potentials in cells of sponges are slow compared to action potentials in neurons. D) Lag occurs because the signal has to be very strong in order to see any response.
A patient with essential hypertension might have pressures of 200/120 mm Hg. This hypertensive state could result in all of the following changes except ________.
A) increased work of the left ventricle B) increased incidence of coronary artery disease C) increased damage to blood vessel endothelium D) decreased size of the heart muscle