Microbes called the group I archaea or mesophilic Crenarchaeota that were found to oxidize ammonia in marine environments are now placed in the phylum ________.
A. Korarchaeota
B. Crenarchaeota II
C. Thaumarchaeota
D. Euryarchaeota
Answer: C
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An antibody molecule consists of a total of
a. two polypeptide chains. b. four polypeptide chains. c. two polysaccharide chains. d. four polysaccharide chains. e. four phospholipids chains.
In many parts of the Everglades in Florida, excessive irrigation is lowering water levels and allowing salt water to enter the freshwater swamps. Why is this a problem for plants that have adapted to life in these swamps?
A. Photosynthesis is inhibited by salt. B. The plant roots cannot take up water if the soil salt concentration is high. C. The salt competes with minerals for uptake by the plants, limiting their growth. D. The plants cannot move sugars down the xylem if there is salt outside of the roots pulling water out. E. Salts bind to nitrogen, preventing it from being taken up.
Which is the most abundant kind of tissue in most animals?
A) connective B) epithelial C) blood D) muscle
What is the mordant in the Gram stain?
a) Iodine b) Safranin c) Alcohol-acetone d) Crystal violet