What is the leading factor in the establishment of new kelp in an area?
a. Amounts of sunlight
b. Type of substrate
c. Density of herbivores
d. Presence of nutrients
c
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Human influenza viruses are usually derived from influenza viruses that infect
A. horses and sheep. B. cattle and water buffalo. C. a variety of primates. D. birds and pigs. E. chimpanzees and gorillas.
Which of the following varies rhythmically with respiration?
A) atmospheric pressure only B) intrapleural pressure only C) intra-alveolar pressure only D) both intrapleural pressure and intra-alveolar pressure E) both atmospheric pressure and intrapleural pressure
Metapopulation dynamics involve the processes of
A) emigration B) extinction C) character displacement D) All of these. E) A and B
It is estimated that humans can produce over 1.5 million different types of antibodies. Which of the following statements regarding this extraordinary variation is INCORRECT?
A. We inherit over 1.5 million different and distinct immunoglobulin genes from our parents at fertilization. B. V and J domains of antibody light chains are randomly joined. C. Random segments of DNA can be removed from antibody genes. D. Cytosines in the variable regions of antibody genes can be converted to uracils via hypermutation. E. V and J domains of antibody heavy chains are randomly joined.