A morphogen is a chemical agent that affects the differentiation of cells and the development of form. Indicate whether the statement is true or false
T
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Embryonic development begins with a single egg fertilized by a single sperm, forming a zygote which then divides by
mitosis. How many cells are present in the embryo at the conclusion of four mitotic divisions?
a. 2 b. 4 c. 8 d. 16 e. 32
How have ocean waters been affected by increased amounts of carbon dioxide in the atmosphere?
A) more acidic B) more basic C) closer to neutral in pH D) richer in aquatic species
Which one of the following best illustrates a density-dependent limiting factor?
A. A farmer uses insecticide to kill large numbers of insect pests. B. As the human population rises, more people will starve. C. In the spring of the year, many animals disperse to new locations. D. Plants usually have difficulty getting enough oxygen.
Answer the following questions true (T) or false (F)
1. Sinusitis is routinely treated with antibiotics, which is appropriate because most cases are due to bacterial infections. 2. In most individuals, symptoms of the common cold and of influenza are virtually impossible to tell apart in severity. 3. To date, only zoonotic strains of hantavirus have been detected.