Which hormone acts on the Sertoli cells to help sperm mature?
a. testosterone
b. FSH
c. LH
d. GnRH
e. hCG
ANSWER: b
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Unicellular cyanobacteria are the most abundant phototrophs in the ocean and perform 80% of marine photosynthesis
Indicate whether the statement is true or false.
The column of water extending in tubes from
plant roots to leaves is maintained by a. cohesion among water molecules. b. ionic bonds. c. covalent bonds. d. hydrophobic interactions. e. hydrophilic interactions.
Your classmate does not have much muscle strength. Her doctor says she has an autoimmune disease, but you didn't quite catch the name the physician gave for the illness. Based on what you have learned, what do you think the diagnosis is?
A) schizophrenia B) senility C) myasthenia gravis D) Alzheimer's disease
A single basic dye is used in simple stains
Indicate whether the statement is true or false