In preparation for mitosis, DNA is copied; this is called DNA __________.
Fill in the blank(s) with the appropriate word(s).
replication
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Who performed classic experiments that supported the semiconservative model of DNA replication?
A) Watson and Crick B) Meselson and Stahl C) Hershey and Chase D) Franklin and Wilkins
The portion of the electromagnetic spectrum visible to the human eye is known as ________.
Fill in the blank(s) with the appropriate word(s).
Infection with ________ may result in peptic ulcers and stomach cancer
A) Campylobacter jejuni B) Helicobacter pylori C) Borrelia recurrentis D) Vibrio parahaemolyticus E) Rickettsia rickettsii
An osmosis investigation was conducted using chicken eggs to represent cells with semi permeable membranes. The mass of each egg was measured to determine how much water diffused into or out of the eggs. The eggs were first soaked in vinegar to dissolve the shell. Each egg was then placed in one of three different solutions for 24 hours. The table below shows the results of the investigation. Based on this experiment, which of the following should be inferred about cells with semi permeable membranes?
A. Substances other than water may also cross the cell membrane. B. Substances other than water may block pores in the cell membrane. C. Water enters the cell when placed in environments of high water concentration. D. Water leaves the cell when placed in environments with a low concentration of solutes