About 4 million years ago, ________ left the African forest to dwell in the grasslands.
A) Dryopithecus
B) Aegyptopithecus
C) Australopithecus
D) Propliopithecus
C) Australopithecus
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Since all organisms contain DNA (or RNA), how can DNA be used as a trait in studying phylogeny?
What will be an ideal response?
Amyotrophic lateral sclerosis (ALS) disrupts
muscle contraction by a. binding actin. b. blocking myofibril. c. killing motor neurons. d. weakening myofilaments. e. none of these.
Horseshoe crabs belong to:
A. the subphylum Uniramia. B. the subphylum Crustacea. C. the class Chilopoda. D. the class Merostomata. E. the class Malacostraca
Site-specific recombination systems ________.
A. depend on enzymes that are often specific for sequences within the host B. are features of some viruses C. do not depend on extensive nucleotide sequence homology D. All of the choices are correct.