A newly discovered microorganism has a circular chromosome that is complexed with histones, but not enclosed within a membrane. The plasma membrane lipids include glycerol dietethers and diglycerol tetraethers. There are no mitochondria or chloroplasts, but the cells do contain 70s ribosomes. This microbe most likely is
A. a protozoan.
B. an archaeon.
C. a fungus.
D. a bacterium.
Answer: B
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The anterior pituitary secretes FSH and LH in response to the releaser ________
a. testosterone b. melatonin c. gonadotropin-releasing hormone (GnRH) d. estrogen
Ionic bonds are important in biological structures. Which of the following pairs of molecules would form an ionic bond?
A) two water molecules B) two amino acids with oppositely charged functional groups C) two different stereoisomers of the same sugar D) two phospholipids E) a water molecule and a lipid
Of the following, which is a proposed explanation for an observation?
a. principle b. law c. theory d. fact e. hypothesis
Neuroendocrine cells release neurohormones which are transported through contact or diffuse through
interstitial fluid. ____________________ Indicate whether the statement is true or false.