"Craft your masterpiece by chiseling away, bit by bit, with the sculptor's patience of daily discipline."
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Beating the MCAT: A Question at a Time


"Craft your masterpiece by chiseling away, bit by bit, with the sculptor's patience of daily discipline."


A scientist is looking to study mouse cells in various stages of mitosis. He obtains a culture of cells and treats them with a chemical that arrests the cells during DNA replication. What is the most likely result of the experiment?

A<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAxNzc1OTU0MzksXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiI5YjM1NmM3NjFhZTkzOTM1In0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkcplykMtg$ >

He will successfully have arrested the cells in various stages of mitosis for observation.
B<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAxODA3NDExNjgsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiI3YjNjOWVjOTc2NjhlN2Q5In0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkfiwXXtpw$ >

The cells will complete mitosis and be arrested during the S phase of interphase.
C<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAxODQ5MzU0NzMsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiIyZmQ4ODIwMDhhOTVmYzViIn0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkd_1LvmIQ$ >

The cells will complete mitosis and will be arrested upon entry into G1.
D<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAxODkxMjk3NzgsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiIxNDc1OTYwZDI4ZmRjN2MzIn0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkeH24aPpA$ >

The cells will be unaffected by the chemical entirely.


Scroll down to see the answer explanation

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Sana Batool
The City University of New York
129 - 95th Percnetile

"I got a 120 on my first CARS practice test, and I amost immediately thought that I would have to postpone my MCAT. I finished the Testing Solutiosn bootcamp, and I ended up scoring 129 on the actual MCAT! I definitely credit Testing Solutions."

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A scientist is looking to study mouse cells in various stages of mitosis. He obtains a culture of cells and treats them with a chemical that arrests the cells during DNA replication. What is the most likely result of the experiment?

A<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAyMDE3MTI2OTMsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiI5ODFkNGM0YWY2MmE0ZTZkIn0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkcktMFw1w$ >

He will successfully have arrested the cells in various stages of mitosis for observation.
B<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAyMDU5MDY5OTgsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiI1ZGEyYjQyMGUzOWUzYjk1In0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkc44Hf3jw$ >

The cells will complete mitosis and be arrested during the S phase of interphase.
C<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAyMTAxMDEzMDQsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiJjZjcyNTc3NTYxMTNhYjhjIn0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkfLs-IbGg$ >

The cells will complete mitosis and will be arrested upon entry into G1.
D<https://urldefense.com/v3/__https://azbgee.clicks.mlsend.com/ty/c/eyJ2Ijoie1wiYVwiOjgxNTg0NyxcImxcIjoxMTk2MDUyMDAyMTUzNDQxODUsXCJyXCI6MTE5NjA1MjAxODMwMTUxMzI2fSIsInMiOiIyY2ZlNDVlZTI1MmViNjkyIn0__;!!PxiZbSOawA!N7ESKDwimlG2WxCH_sxTb81LVe8qV-r1WO22gI7lea1d6xNDWGGQppUmUbX_kLma0HTYTmnqv5p28PsomrYO0wp1RSA6rkdkKkjPmA$ >

The cells will be unaffected by the chemical entirely.


DNA replication in the eukaryotic cell cycle happens only during S phase. Mitosis involves only nuclear division, not DNA replication. Therefore mitosis would be unaffected by the chemical and the cells would complete mitosis and would only be arrested once they entered S phase, making (B) the correct answer.

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Testing Solutions
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