Tutor profile: Dana T.
Subject: Microsoft Excel
You imported a list into Excel, but the list opened with a blank row between each row of data. How can you easily delete all the blank rows in a table?
Click and drag to highlight the area of the spreadsheet where you want to delete empty rows. In the Home tab, select "Find and Select" with the binocular icon. Select "Go To Special". A dialogue box will pop up. Select "Blanks" and click "OK". Excel will select all of the blank cells. In the Home tab, Cell section, click "Delete" to see the pull-down menu. Click "Delete Sheet Rows". The highlighted, blank rows have been removed without affecting any other blank cells that may be in the table.
Subject: Basic Chemistry
What is the difference between periods and groups on the periodic table of elements?
Periods are the horizontal rows across the table. The number of protons in the nucleus increase by one moving from left to right. Groups are the vertical columns of the table. These elements share similar properties, which usually includes having the same number of electrons in their valence shell.
Describe the three phases of polymerase chain reaction (PCR).
PCR is used to amplify a target piece of DNA. First, the double helix is denatured (separated into single strands) by heating. Second is the annealing phase, in which the solution is cooled to allow primers (short strand of DNA) to bind to the target DNA. The solution is then heated slightly to begin the third phase: elongation. During this phase, nucleotides extend from the primer, forming the complimentary chain to the target DNA. This cycle is repeated, doubling the amount of DNA each time.
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