Which of the following could be a density-independent factor limiting human population growth?

A) social pressure for birth control
B) earthquakes
C) plagues
D) famines


Answer: B

Biology & Microbiology

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Which of the following describes the process of eutrophication?

a. Nutrient runoff causes the overgrowth of algae. b. Minerals and nutrients cycle through the biotic world. c. Excess phosphorus decomposes plant roots. d. Rainwater falls to the ground through sulfur dioxide gas.

Biology & Microbiology

Which region of the brain is responsible for

controlling reflexes such as swallowing, coughing, and sneezing?

a. midbrain b. pons c. thalamus d. medulla oblongata e. cerebrum

Biology & Microbiology

While examining a human cell that functions normally, you determine that it has 45 functional chromosomes and one chromosome that is almost completely inactive. You immediately decide that it is very likely that this cell ________

A) came from a normal human female B) is lacking a chromosome C) is a gamete D) will become cancerous if one or two more genes are mutated

Biology & Microbiology

Step 3 in glycolysis requires the activity of phosphofructokinase to convert fructose 6-phosphate into fructose 1,6-bisphosphate. Which of the following molecules is an allosteric inhibitor of this enzyme?

(a) Pi (b) AMP (c) ADP (d) ATP

Biology & Microbiology