In the above figure, which letter points to the urethra?
A) A
B) B
C) C
D) D
E) E
Answer: E
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Only particles smaller than ________ µm in diameter reach the lungs
A) 10 B) 20 C) 30 D) 40
The most common form of hemophilia is a defect in blood clotting factor VIII, which is caused by a recessive form of a gene carried on the X chromosome. A girl is born with hemophilia. Both parents have normal phenotype
Which of the following might explain this girl's hemophilia? A. A nondisjunction event in sperm production resulted in her receiving X and Y chromosomes from her father, and an X from her mother; she is XXY. B. Nondisjunction during egg formation resulted in her receiving no X chromosome from her mother, but an X from her father; she is XO. C. Nondisjunction during sperm formation resulted in her receiving no sex chromosome from her father and an X chromosome from her mother; she is XO. D. Nondisjunction during egg formation resulted in her receiving two X chromosomes from her mother and an X chromosome from her father; she is XXX. E. She inherited an X chromosome from her father and the X carrying the defective allele from her mother.
To observe the three-dimensional structure of a cell the best type of microscopy would be
A. fluorescence microscopy. B. standard light microscopy. C. scanning electron microscopy. D. differential-interference light microscopy. E. transmission electron microscopy.
The trophoblast secretes glycolipids to assist implantation within the endometrium
Indicate whether the statement is true or false