The scrotum is a sac-like structure outside the abdomen in which the testes are suspended. Why is this structure essential?
A. Sperm must be closer to the penis to be ejaculated.
B. There is not enough space in the abdomen to grow properly.
C. Lower temperature is required for normal development of sperm.
D. There is too much hormonal influence if they remain in the abdomen.
C. Lower temperature is required for normal development of sperm.
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Which of the following is an example of herd immunity?
A) Brucellosis is no longer found in farm animals in the United States. B) If 70% of the population is immunized against polio, the disease will be essentially absent from the population. C) Federal law requires that all cattle not immune to anthrax be destroyed. D) All farm animals used for food must be immunized against all the common agents of disease that infect humans.
The nuclear membrane of eukaryotes originated from
a. captured aerobic bacteria. b. prebiotic soup. c. captured cyanobacteria. d. invaginations of the plasma membrane. e. the large circular chromosome of the prokaryotic ancestor.
Rigor mortis sets in after the death of humans and other animals because the supply of ATP decreases to the point at which calcium can no longer be removed from the cell. At this point, the myosin molecules attach to the thin filament
The muscles stiffen, and limbs cannot be moved. Why and for how long does the muscle then remain in this continuously contracted state?
________ are a type of association between plant roots and fungi in which the fungi do not penetrate the root cells.
Fill in the blank(s) with the appropriate word(s).