The branching "tree of life" analogy
A) accurately reflects evolution because once a split occurs, species on different branches evolve independently.
B) has been discredited because it does not help us understand evolutionary relationships among organisms.
C) fails to account for horizontal gene transfer, in which species on different branches exchange genes.
Answer: C
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The portion of an amino acid that makes the amino acid unique among the 20 different amino acids is
A. carboxyl B. amino C. hydrocarbon D. the side chain or R-group E. peptide bonding
Which one of the following is the earliest event in the process of fertilization?
A) Sperm contact the jelly coat around the egg. B) The sperm head plasma membrane fuses with the egg plasma membrane. C) Enzymes from the acrosome are released. D) The sperm nucleus enters the cytoplasm of the egg.
What does the following word equation represent? Glucose+Oxygen-->Carbon Dioxide+ Water+ Energy
A photosynthesis B regeneration C respiration D transpiration
Amebiasis symptoms include
A. urinary frequency and pain, and vaginal discharge. B. bloody, mucus-filled stools, fever, diarrhea, and weight loss. C. chills, fever, and sweating. D. fever, swollen lymph nodes, and joint pain. E. sore throat, low-grade fever, and swollen lymph nodes.