Elephants belong to the order
A. Carnivora.
B. Proboscidea.
C. Artiodactyla.
D. Cetacea.
E. Edentata.
Answer: B
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Which organelles are sometimes referred to as rough or smooth, depending on their appearance in electron micrographs?
a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. endoplasmic reticulum
In its non-phosphorylated state, the retinablastoma protein (Rb) binds to and inhibits the activity of:
A. cyclin D B. the E2F transcription factor C. cyclin-dependent kinase D. p53
The sense of rotational equilibrium is accomplished by hair cells found in the
A. middle ear. B. outer ear. C. cochlear duct. D. ampullae. E. organ of Corti.
Gills are unsuitable for animals living on land because
A) the large external surface area of gills would allow dehydration of the animal. B) air cannot diffuse across the gill surface. C) there is no way to get air into the gills. D) gills require high blood pressure.