The contraction of the atria and beginning relaxation of the atria is shown as the ________ on an EKG.
A. P wave
B. P-Q (or P-R) interval
C. QRS complex
D. Q-T interval
E. T wave
Ans: B. P-Q (or P-R) interval
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Which of the following statements about mitochondria is false?
A) Because of the role of the mitochondria in producing cellular energy, mitochondrial diseases often affect the muscles and nervous system. B) Because mitochondria are present in the cytoplasm, mitochondrial diseases are transmitted maternally. C) Like nuclear genes, mitochondrial genes usually follow Mendelian patterns of inheritance. D) Mitochondria contain circular DNA molecules that code for proteins and RNAs. E) Many mitochondrial genes encode proteins that play roles in the electron transport chain and ATP synthesis
Where does the exchange of materials between cells and the blood occur?
A. arteries. B. veins. C. capillaries. D. All of these exchange materials.
Lithoautotrophs use inorganic nutrients for carbon and energy sources.
Answer the following statement true (T) or false (F)
Which of the following is found in DNA but not in RNA?
A. ribose B. nucleotides C. adenine D. thymine E. uracil