The reagent that stains the organisms demonstrated in Image C is:
a) Basic fuchsin
b) Gallego solution
c) Methylene blue
d) Crystal violet
Answer: d) Crystal violet
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Each nephron of the kidney consists of a long tubule and associated small blood vessels. Blood cells and plasma proteins are too large to enter with the glomerular filtrate. What is the correct path for the filtrate to follow through the nephron in the production of urine?
A. Bowman's capsule ? distal convoluted tubule ? loop of Henle ? proximal convoluted tubule ? collecting duct B. Bowman's capsule ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule ? collecting duct C. Bowman's capsule ? loop of Henle ? proximal convoluted tubule ? distal convoluted tubule ? collecting duct D. Bowman's capsule ? collecting duct ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule E. collecting duct ? proximal convoluted tubule ? loop of Henle ? distal convoluted tubule? Bowman's capsule
The type of viral infection in which a virus enters a host cell, immediately replicates, and causes the host cell to burst is
a rare form of viral infection. a transgenic infection. a lysogenic infection. a lytic infection. a systematic infection
Which of the following statements concerning bacterial flagella is true?
a. The flagella of bacteria and archaea are homologous. b. The mechanism of movement in bacterial flagella is different from that in protist flagella. c. Although the mechanism of movement in all flagella is the same, bacterial flagella have an independent evolutionary origin. d. All bacteria have flagella. e. Bacterial flagella are much larger than eukaryotic flagella
We do not have any fossils of unicellular prokaryotes. The first organisms to appear in the fossil record are unicellular eukaryotes.
Answer the following statement true (T) or false (F)