Which of the following defines "aging"?
A. the development of disease or disability
B. progressive changes from infancy until death
C. the onset of sexual maturity
D. the failure to thrive
E. the loss of function of various body systems
Answer: B
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All proteins are enzymes.
Answer the following statement true (T) or false (F)
Minerals move through the tissues of the plant root from the epidermis to the xylem in the center primarily by
a. passive transport with no expenditure of ATP. b. active transport with expenditure of ATP. c. active transport with no expenditure of ATP. d. facilitated diffusion with expenditure of ATP. e. facilitated diffusion without expenditure of ATP.
A pure substance that cannot be broken down into another substance is known as a(n) ____
a. proton b. electron c. compound d. element e. isotope
A(n) (operon/codon/gene) is a specific sequence of nucleotides that codes for a protein or an RNA molecule.
Fill in the blank(s) with the appropriate word(s).