Which of the following statements is false
concerning X chromosome inactivation?
a. It is an accident of evolution.
b. It is an example of dosage compensation.
c. It is a gene control mechanism.
d. Normal development of female embryos
depends on it.
e. It does not occur in males.
Answer: a
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The RNA polymerase enzymes of the Archaea are more similar to eukaryotic enzymes than to bacterial enzymes.
Answer the following statement true (T) or false (F)
Sheep blood agar serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
Immune system cells differentiate between self and foreign cells by their ________.
A. markers B. sizes C. shapes D. cell processes E. cell walls
Where do the light-dependent reactions take place?
a. stroma b. intermembrane space c. thylakoid membrane d. thylakoid lumen