The human ____________ consists of 33 vertebrae that are cushioned with cartilage disks and provide support and protection to the spinal cord.
A. pectoral gridle
B. pelvic girdle
C. scapula plate
D. rib cage
E. vertebral column
E. vertebral column
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The hormone that promotes conservation of water in the human endocrine system is the
A. antidiuretic hormone (ADH). B. prolactin. C. oxytocin. D. luteinizing hormone (LH). E. thyroid-stimulating hormone (TSH).
Endorphins are ____
a. neuromodulators only b. stimulators of brain and nervous activity only c. inhibitors of pain perception only d. neuromodulators and stimulators of brain and nervous activity e. neuromodulators and inhibitors of pain perception
The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans)
Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female? A) 4:1 male to female B) 1:2 male to female C) 1:1 male to female D) 2:1 male to female E) 3:1 male to female
The volcanic island Selkirk arose from the North Atlantic off Iceland in 1948. The first organisms to start living there are said to be ________
A) central species B) climax species C) pioneer species D) rogue organisms