Diatoms reproduce by:
A. binary fission
B. a sporic life cycle
C. a gametic life cycle
D. a zygotic life cycle
E. spontaneous generation
C. a gametic life cycle
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Photoreceptors are found in the
(a) lens. (b) ciliary body. (c) iris. (d) retina.
One difference between the erythrocytes of mammals and other vertebrates is:
a. mammal erythrocytes lack nuclei. b. mammal erythrocytes respond to changes in water concentration. c. mammal erythrocytes are oval with swollen centers. d. other vertebrates do not have erythrocytes. e. other vertebrates use a respiratory pigment other than hemoglobin.
The pericardium, or pericardial sac
A. is a double-layered, closed structure. B. anchors the heart in the mediastinum. C. has a tough fibrous connective tissue outer layer. D. has an inner layer of squamous epithelial cells. E. has all of these characteristics.
A gene that has been manipulated by molecular biologists is called ___ DNA.
What will be an ideal response?