Mammals evolved approximately 200 million years ago from:a
fish.
b. amphibians.
c. reptiles.
d. birds.
e. arthropods
C
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Although ferns and conifers maintained their diversity into the early Cenozoic era, ____ may have hastened their
decline in the early Cretaceous.
a. cycads b. gymnosperms c. angiosperms d. invertebrates e. mammals
In proteins, nitrogen bases link covalently to ribose in DNA
Indicate whether the statement is true or false.
HIV-1 Group M is responsible for 95% of human infections. When is it estimated that HIV-1 Group M was transferred to humans?
A) 1980 B) 1960 C) 1930 D) 1995 E) 1900
Kinesin 1 and myosin II share each of the following features except
A) two heads. B) dimers formed by heavy chain tails coiled around each other. C) formation of bipolar filaments. D) plus end directed motor activity. E) ATPase activity.