Why is the blood-testis barrier important? a. because some blood contents are toxic to the spermatozoa b. because immature sperm cells lose their motility when they encounter any blood component c. because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system d. actually, the blood-testis barrier has no function?

Gregor mendel is best known for his work with pea plants and for uncover many of the mysteries of genetics. one of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. what is the the name given to these units of inheritance which can be found on chromosomes? a) centromeres b) cytoplasm c) genes d) nucleotides