Leydig cells ________
a. secrete testosterone
b. activate the sperm flagellum
c. support spermatogenesis
d. secrete seminal fluid
Answer: a. secrete testosterone
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____ are cells of the adaptive immune system that can activate B cells by binding to MHC class II protein–antigen complexes
Fill in the blank with the appropriate word.
In the garden peas example above, a tall plant with white flowers crossed with a dwarf plant with
purple flowers produces 1/4 tall purple flowers, 1/4 tall white flowers, 1/4 dwarf purple flowers, and 1/4 dwarf white flowers. What is the genotype of the parents? What will be an ideal response?
Once labor begins in childbirth, contractions increase in intensity and frequency, causing more contractions to occur until delivery. The increasing labor contractions of childbirth are an example of which type of regulation?
A) positive feedback B) negative feedback C) feedback inhibition D) enzymatic catalysis
The study and diagnosis of antigen-antibody interactions in the blood is known as
A) immunology. B) hematology. C) serology. D) cytology. E) histology.