Which of the following is not a species within the genus Homo?
A. Homo habilis
B. Homo sapiens
C. Homo erectus
D. Homo ramidus
E. Homo floresiensis
Answer: D
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If a stretch of human double stranded DNA contains 47% G and C bases, then ____
a. it contains 47% A and T bases b. there are more pyrimidines than purines c. there are more purines than pyrimidines d. it contains 53% A and T bases
e. there are no genes in this stretch of DNAThe first step in the scientific method is to
a. identify a problem. b. propose a solution. c. predict the results of an experiment. d. perform an experiment. e. draw a conclusion.
When a signaling molecule binds to a G protein linked receptor, the ligand-receptor complex associates with GDP
protein and causes GDP to be replaced by GTP. __________________ Indicate whether the statement is true or false.
It is speculated that one of the first kinds of organic molecules formed on primitive Earth was
A. amino acid. B. ammonia. C. oxygen. D. protein.