In Drosophila, a gynandromorph, which is composed of equal parts of male and female tissue, results from
A) an XX female losing one X chromosome during the first mitotic division after fertilization.
B) an egg carrying an X chromosome fertilized by a Y-carrying sperm.
C) a normal egg fertilized by both an X-carrying sperm and a Y-carrying sperm.
D) the fusion of a female embryo with a male embryo.
A) an XX female losing one X chromosome during the first mitotic division after fertilization.
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The optimal pH for enzyme 2 is:
a. 2. b. 3. c. 4. d. 5. e. 6.
Answer the following statements true (T) or false (F)
1.BMI stands for body mass index. 2.The solid waste that leaves the digestive tract of a vertebrate is called chyme. 3.The process by which a cell engulfs particulate matter is phagocytosis. 4.In herbivores, the cecum is small because the food they ingest is easily digested. 5.Symbiotic bacteria in the large intestine help prevent infection by pathogenic bacteria.
The system of taxonomy used today was originated by (Linnaeus/Darwin/Woese). (Be sure to capitalize your answer.)
Fill in the blank(s) with the appropriate word(s).
How does the toxin from Clostridium tetani produce its action?
A. it fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts. B. the smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system. C. it is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin. D. it destroys tissues, including muscle and fat. E. Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.