What is the infective form of Entamoeba histolytica and Giardia intestinalis?
A) cysts
B) trophozoites
C) merozoites
D) sporozoites
Answer: A
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Some archaea have unique phospholipids in their cytoplasmic membrane that
A) form a monolayer due to the presence of diglycerol tetraethers. B) form a bilayer due to the presence of sterols. C) form a stable ring structure due to the presence of crenarchaeol. D) form a bilayer due to the presence of phosphatidylethanolamine.
Sharks are osmoconformers that maintain osmolarity with the saltwater but keep ion concentrations similar to osmoregulators. To do this they must use non-ions to osmoregulate, such as urea. As such sharks take on excess ions from the water because their bodies are at a significantly lower ion level than saltwater. How are the excess ions eliminated?
A. diffusion across the gills B. active transport across the gills C. Rectal gland D. none of the answers
Which of the following can cross a biological membrane by simple diffusion?
a. Glucose b. Fatty acid c. Amino acid d. Protein
The sequence of amino acids that makes up protein molecules is determined by the sequence of
a. bases in DNA b. glucose in DNA c. ribosomes in the cytoplasm d. chloroplasts in the vacuoles