What is the normal pH of blood?
A. extremely acidic
B. neutral
C. slightly acidic
D. extremely basic
E. slightly basic
Answer: E
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An example of biomagnification is the ability of Desulfovibrio to catalyze production of methyl mercury, which is lipid soluble, thereby increasing the concentration of mercury in the food chain.
Answer the following statement true (T) or false (F)
The chewy, stringy supporting strands in
celery are which cells?
a. xylem b. collenchyma c. phloem d. sclerenchyma e. parenchyma
HIV infects cells by recognizing the cell-surface markers with its own
A. glycoproteins. B. capsid protein. C. reverse transcriptase. D. DNA. E. enzymes.
The antibiotic chloramphenicol binds to the 50S subunit of the ribosome as shown in Figure 20.3. The effect is to
a. Prevent attachment of tRNA. b. Prevent peptide bond formation. c. Prevent transcription. d. Stop the ribosome from moving along the mRNA. e. Prevent polypeptide formation in eukaryotes.