New species evolve from pre-existing species by the accumulation of
A. metabolic events.
B. genetic mutations.
C. proteomes.
D. reproductive events.
E. developmental events.
Answer: B
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The antibiotic nitrofurantoin is effective against both gram-positive and gram-negative bacteria. This antibiotic is effective against which type of specimen?
a. Blood b. Cerebrospinal fluid (CSF) c. Sputum d. Urine
Referring to the figure of sperm penetration and fusion, match the lettered description with the correct numbered step in the figure.
A. Some of the zona pellucida is degraded by acrosomal enzymes.
B. Enzymes are released by cortical granules that harden the zona pellucida.
C. Sperm and egg fuse at the plasma membrane.
D. Sperm penetrates the corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.
1. Step I
2. Step II
3. Step III
4. Step IV
5. Step V
6. Step VI
Which of the following is a gastropod?
a. clam. b. snail. c. squid. d. octopus.
Which term applies to the type of graft rejection that begins within a few weeks or months after transplantation of an organ and is due to CD8 reactive T cells?
A) acute rejection B) hyperacute rejection C) chronic rejection D) accelerated rejection