The Cambrian explosion of life is most notable for the:
A) movement of life from the oceans to the land masses, including all kingdoms.
B) appearance of the first photosynthetic organisms.
C) appearance of stromatolites.
D) appearance of multicellular animals, including nearly all phyla of the animal kingdom.
Answer: D
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In humans, where is the tympanic membrane?
a. in the outer ear, adjacent to the pinna b. deep within the middle ear c. between the outer ear and the middle ear's cavity d. adjacent to the stapes e. between the middle ear and inner ear
In biology lab, your class counts the number of people with different colors of hair and eyes. Your instructor says that these traits are variable and difficult to trace in each family. The reason is that these two traits depend on more than one gene, and are called
A. recessive. B. incomplete dominant traits. C. codominant. D. pleiotropic. E. polygenic.
Which protein contains a binding site for ATP?
A. myosin B. tropomyosin C. troponin D. myelin E. All muscle proteins must have an ATP binding site.
In a plant cell, DNA may be found _____
A) only in the nucleus B) only in the nucleus and chloroplasts C) in the nucleus, mitochondria, and chloroplasts D) in the nucleus, mitochondria, chloroplasts, and peroxisomes