1. Barr bodies at the edge of the typical cell nucleus and drumstick appendages in the nuclei of neutrophils from a blood sample represent the
A) inactive heterochromatin of cells from a female
B)active euchromatin of cells from either sex
C) parts of a chromosome that become visible during mitosis
D) structures seen only during meiosis in spermatogenesis and oogenesis.
2. The hormone that stimulates the growth of ovarian follicles in females and the production of sperm in the testes of males is
A) growth hormone (GH, or somatotropin)
B) thyroid stimulating hormone (TSH, or thyrotropin)
C) adrenocorticotropic hormone (ACTH, or corticotropin)
D) follicle-stimulating hormone (FSH, or folliculotropin)
3. When the concentration of ADH rises in the blood
A) the walls of the collecting ducts become less permeable to dissolved solutes and water.
B) water channels, or aquaporins, appear in the cell membranes of the collecting duct epithelial cells promoting the reabsorption of water from the filtrate.
C) the ultrafiltrate flowing through the collecting duct becomes more hypotonic.
D) a greater volume of dilute urine is excreted.