Which of the following is true of gene expression in cells? Choose all that apply 1. Some genes are expressed
2. Some genes are repressed
3. A cell's entire genome (collection of genes) are always expressed
4. Stem cells are undifferentiated
5. Stem cells are differentiated
6. A differentiated cell can change which genes are active and which ones are not

please help meh taking a quiz and i have no idea what this answer is );

Agene in a type of bacteria when the ses bacteria reproduce asexually this mutation can only be inherited by

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?