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If a scientist does an experiment and gets a result, but no other scientists are able to repeat the experiment and get the same results, what does that mean?

What parental blood type pairing would NOT be able to produce a child with type O blood?

Carbon can form many kinds of complex molecules because:

If a mother chooses not to vaccinate her children, who is at risk for contracting and possibly suffering from the  disease?  (Note: Remember, vaccinations greatly reduce the risk of contracting the disease but are NOT 100% protection.)

Extra Credit +1 points (instructor graded): Based on this diagram, which of these organisms is the keystone species demonstrated in Yellowstone National Park?

This organelle, shown as J, is the most noticeable in a typical eukaryotic cell and contains the genetic information of the cell.  

Extra Credit +2 pts (instructor graded): A plant is suffering from drought and beginning to wilt. Which large cell component is affected and what type of molecule is being lost from this structure, respectively?

This organelle, labeled as D,  produces ATP to power the cell.

Using the diagram below, match the labels with their correct cell structure:  

Which of the following is the best and most accurate description of what “gene expression” is?