Replication of DNA begins at a/an ________ rich area.
A. guanine-cytosine
B. adenine-thymine
C. adenine-cytosine
D. guanine-adenine
E. uracil-adenine
Answer: B
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Which of the following best describes the process of ventilation?
A) the movement of oxygen gas through the blood of the circulatory system B) the movement of carbon dioxide gas through the blood of the circulatory system C) the movement of the respiratory medium past the respiratory surface D) the diffusion of gases into and out of the circulatory system E) the diffusion of gases into and out of tissues where cellular respiration occurs
How are transformed bacteria that contain a plasmid with an inserted foreign gene identi?ed?
What will be an ideal response?
The reactants of photosynthesis are
A. oxygen and water. B. sunlight and carbon dioxide. C. water and carbon dioxide. D. water and glucose. E. sunlight and chlorophyll.
How many days after fertilization does the zygote become a ball of cells?
a. five days b. four days c. one to two days d. six to eight days e. it depends on the age of the mother