What ultimately is the greatest threat to
biodiversity?
a. plant pathogens
b. exotic species
c. unthinking humans
d. mineral and energy use
e. conservation efforts
C
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Some cells have several nuclei per cell. How could such multinucleated cells be explained?
A) The cell underwent repeated cytokinesis but no mitosis. B) The cell underwent repeated mitosis with simultaneous cytokinesis. C) The cell underwent repeated mitosis, but cytokinesis did not occur. D) The cell had multiple S phases before it entered mitosis.
Whether an organism is a phototroph or a chemotroph depends on its source of energy.
Answer the following statement true (T) or false (F)
Which of the following causes blood to move through veins?
A) vasodilation B) contraction of smooth muscle C) blood pressure D) contraction of skeletal muscle
What is the physical basis for the independent assortment observation that Mendel made?
A) Homologous chromosomes are randomly aligned and separated during meiosis. B) Recombination (crossing over) occurs in meiosis. C) Sister chromatids do not separate until meiosis II. D) Male and female gametes are produced in separate organs in separate individuals. E) There are two chromosome divisions in meiosis.