Explain the difference between crossing over and genetic variation

Define the first and second laws of thermodynamics.

How are bacteria able to change their patterns of protein synthesis so quickly in response to environmental changes?

How can a stem cell contain the same genetic information, yet specialize as bone cells nerve cells, muscle cells and connective tissue cells?

How is a palisade cell specialized to do it's function?

The blank * of the cell direct cell activity and ask like the control center

Students planted three bean seeds after several days, they observed that the seeds' roots were growing downward into the soil which type of tropism were the roots displaying A. Geotropism B. Thigmotropism C. Phototropism D. Photoperiodism

A farmer is trying to determine why some weeds sprayed with weed killer do not die. to begin a scientific investigation of this issue, what would be the first step for the farmer?

What do viruses have to support the idea that they are living?

Suppose a population of rabbits is introduced to an environment that has hot summers and extremely cold winters. Every winter, many rabbits die because of the cold and the lack of food. The rabbits have a range of ear sizes.

True or false: when individuals of a parent species are separated geographically, one population of separated individuals is more likely to acquire neutral mutations than the other.