#Question id: 19090
#Unit 4. Cell Communication and Cell Signaling
#Question id: 5804
#Unit 8. Inheritance Biology
The gene that is mutated in cases of cystic fibrosis encodes an ion transporter protein normally expressed in the respiratory and digestive tracts along with other locations. Individuals homozygous for the most common mutation in this gene (ΔF508) died at very early ages prior to the advent of advanced medical intervention. Despite this, the mutation exists at relatively high frequency in populations of European descent. One potential explanation is that heterozygotes for such mutations may be relatively immune to the lethal effects of diseases such as typhoid fever. Which statement below is most accurate?
#Question id: 11923
#Unit 10. Ecological Principles
You are interested in studying how organisms react to a gradient of a variety of abiotic conditions and how they coexist in this gradient. The best location in which to conduct such a study is
#Question id: 11504
#Unit 9. Diversity of Life Forms
Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes?
#Question id: 2660
#Unit 2. Cellular Organization
In the lactose operon, the molecule that causes the repressor to fall off the promoter is which of the following?