Answer the following questions true (T) or false (F)
1. Genetic diversity may be one of the characteristics of a biologically diverse community.
2. Biodiversity is essential for all communities to survive.
3. The term "niche" is usually limited to a description of the physical surroundings in which a species is normally found.
1. TRUE
2. FALSE
3. FALSE
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Na+ ion concentrations are higher outside the cell than inside the cell. What type of transport system is required to move Na+ ions in and out of the cell?
A. Na+ moves into the cell by facilitated diffusion and out of the cell by active transport B. Na+ moves in and out of the cell by passive diffusion C. Na+ moves in and out of the cell by active transport D. Na+ moves into the cell by active transport and out of the cell by facilitated diffusion E. Na+ moves into the cell by facilitated diffusion and can not move out of the cell
The blood vessels of the umbilical cord are formed by which extraembryonic membrane?
a. yolk sac b. chorion c. allantois d. amnion e. placenta
Which of the following statements about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.
Answer the following questions true (T) or false (F)
1. Under ideal conditions, the number of DNA molecules produced during PCR increases exponentially. 2. Sticky-end fragments generated by EcoRI will hydrogen bond to any other sticky-end sequence. 3. The human microbiome is very uniform across the entire species Homo sapiens in all geographic locations.