Differentiate between density-dependent and density-independent factors affecting population growth
Provide two examples for each, along with a brief explanation. What will be an ideal response?
Concepts to Consider: Density-dependent factors are those whose influence on the growth of a
population reflects the population density. As the population density increases, the impact of these
factors increases and contributes to a slowing of the growth rate through an increase in the death rate
or a decrease in the birth rate. The converse is also true. Examples of density-dependent factors include
predation, disease, and competition. Density-independent factors tend to be abiotic, are not influenced
by population density, and may have unpredictable effects on the population. Examples of densityindependent
factors include unusual weather events such as early freezes, floods, fires, and hurricanes.
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Serial dilutions can be used to estimate the total number of bacterial cells in a solution, including living and dead cells.
Answer the following statement true (T) or false (F)
Which of the following statements about the distal convoluted tubule is false?
A. The filtrate entering the tubule is hypertonic relative to the interstitial space. B. Urea is the principal solute found within the filtrate in the distal convoluted tubule. C. Other wastes from the bloodstream are actively secreted into the distal convoluted tubule. D. The distal convoluted tubule delivers filtrate to the collecting duct. E. None of these statements about the distal convoluted tubule is false.
Which tissue is striated and can contract rapidly, producing voluntary movements?
a. skeletal muscle b. smooth muscle c. bone tissue d. cardiac muscle e. adipose tissue
When is it believed that sponges evolved?
a. 3.2 billion years ago b. 1.2 billion years ago c. 870 million years ago d. 650 million years ago e. 420 million years ago