Which nondisjunction disorder must be due to an event in sperm development?
A. XO
B. XXX
C. XXY
D. XYY
E. Trisomy 21
Answer: D
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When a cell is in equilibrium with its environment, which of the following occurs for substances that can diffuse through the cell?
A) There is random movement of substances into and out of the cell. B) There is directed movement of substances into and out of the cell. C) There is no movement of substances into and out of the cell. D) All movement of molecules is directed by active transport.
The main form in which sugars are transported in the phloem sap is
a. glucose. b. lactose. c. starch. d. sucrose. e. fructose.
Important components of coenzymes are ________.
A. ribozymes B. substrates C. metallic ions D. vitamins E. active sites
Exposure to a teratogen during pregnancy can result in ____
a. decreased risk of miscarriage b. newborns of higher birth weight c. reduced vitamin C levels for the mother-to-be and for her fetus d. fetal facial and cranial deformities e. increased risk of rubella