A plant species X with n=5 chromosomes was crossed with a related species Y with n = 7 chromosomes. The F1 hybrids produced only a few pollen grains, which were used to fertilize the ovules of related species Z with n=7 chromosomes. A few plants were produced from this cross, […]

Consider a culture into which two E. coli strains are inoculated. Strain A is normal with g=21 min at 37 degrees C, and 42 mins at 27 degrees C. Strain B has a temperature-sensitive mutation, such that g=55 mins at 37 degrees C, and 39 mins at 27 degrees C. […]

When using the Nernst equation to calculate membrane potential, we are making several assumptions about conditions in the cell. Which of the following is not a good assumption? a. The temperature is 37 degrees C.b. The plasma membrane is primarily permeable to Na+.At rest, the interior of the cell is […]

The researchers concluded that at some time in the past, a slug ate algal cells and their DNA was somehow incorporated into the slug’s DNA. This process is called horizontal gene transfer and may have happened numerous time in many different species. Why could horizontal gene transfer be an important […]