The diversity of birds is reflected in their feeding mechanisms and locations. Shorebirds, for example, include birds with different length and shape of beaks, length of legs, and food and shore location preference. Describe an evolutionary process that could lead to the observed diversity
What will be an ideal response?
The birds have been able to share the food resources of the shoreline by specialization. This is an example of resource partitioning [described in Chapter 2] that results from competitive pressures. The birds have evolved specialized features, including bill shapes, which enable each bird species to more efficiently (relative to the others) feed on a particular shoreline prey species. Different leg lengths enable some birds to wade deeper in the water to forage for different species, while other birds with shorter legs are restricted to foraging in areas above the water line.
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With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms
Indicate whether the statement is true or false
The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. primer annealing B. antibody binding C. denaturation D. synthesis
Collection of microtubules that assist in the orderly distribution of chromosomes during cell division.
What will be an ideal response?
What types of molecules may NOT need transport proteins to be able to cross cytoplasmic membranes?
A) large molecules B) ions C) small hydrophobic molecules D) small hydrophilic molecules E) nothing crosses cytoplasmic membranes without transport proteins