You have isolated a prokaryotic cell. The first step in identification is a(n)
A) Gram stain.
B) lactose fermentation test.
C) endospore stain.
D) flagella stain.
E) DNA fingerprint.
A
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Which of the following is an illness caused by a mutation in mitochondrial DNA?
A) Duchenne muscular dystrophy B) Hemophilia C) Leigh syndrome D) Marfan syndrome
After the chamber was flooded with white light, the bacteria were
a. evenly distributed throughout the chamber. b. clustered on the algal filament. c. clumped along certain areas of the algal filament. d. actively avoiding the algal filament.
What is the dominant vegetation of the savanna?
A) Trees that lose their leaves B) Cocoa C) Grasses D) Trees with waxy needles E) Lichens and scrub willows
Anna is conducting an experiment using a pH indicator that is red at low pH, green at neutral pH and purple at high pH. She starts with a green solution. When she adds compound X to her solution it turns purple. Then she adds compound Z to the solution and it turns green. She adds more Z, the solution remains green. These observations suggest X is ________ and Z is ________
A) a base; a buffer B) an acid; a base C) a base; a strong acid D) an acid; a buffer E) a buffer; a base