If a human female has 2 Barr bodies per cell, it is almost certain that
A. her father had 1 Barr body per cell.
B. her mother also had 2 Barr bodies per cell.
C. she is genetically a normal fertile female.
D. she is genetically a male with female characteristics.
E. she developed from a fertilized egg with 3 X chromosomes.
Answer: E
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Place the following statements in the correct order of occurrence
i. calcium released from endoplasmic membrane ii. action potential reaches axon terminal iii. myosin head binds to actin iv. neurotransmitter binds to receptors
a. i, ii, iii, iv b. ii, iv, i, iii c. iv, ii, i, iii d. ii, iii, i, iv
The growth-promoting substance that promotes stem elongation and bending toward light is produced
primarily in
a. root tips, traveling to the stem in the xylem. b. the center of the stem region where elongation or bending occurs. c. flowers and flower buds. d. the shoot tip. e. root tips, traveling to the stem in the phloem.
If a plasma membrane is analogous to the cell, which of the following is analogous to the animal body?
a. a reproductive system b. a muscle system c. the skin d. a digestive system
Tuberculoid leprosy
A. causes asymmetrical, shallow skin lesions with loss of pain sensation. B. is the most disfiguring. C. pathogen grows extensively in cooler body areas such as nose, ears, testes. D. complications include secondary infections, kidney or respiratory failure. E. includes all of these choices.