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### Questions on the PCAT

Posted: **Fri Dec 22, 2017 11:36 am**

by **simsimjoey**

Hi, got two questions.

1. Calc section on review book does not cover integration by parts, yet there is a question on that. Should we be ready to solve integration by parts questions as well? Maybe also substitution rules for derivatives?

2. Aren't polyribosome (polysome) observable in eukaryotes as well as prokaryotes? The question on the review book said this was wrong, I'm confused.

### Re: Questions on the PCAT

Posted: **Fri Dec 22, 2017 12:45 pm**

by **NS_Tutor_Sophia**

Hi simsimjoey,

Integration by parts is simply the reverse of the product rule for differentiation, which is covered in Chapter 32. Integration by parts is a low-yield topic that is unlikely to be tested on the PCAT. You can find all the topics that are tested on the PCAT here:

http://pcatweb.info/downloads/about/PCA ... eItems.pdf. Is there a specific question you would like to discuss? If by the substitution rules for derivatives, you are referring to the Chain Rule, that is definitely something you might see on Test Day and is also covered in Chapter 32.

Polyribosomes are indeed also found in eukaryotes, but prokaryotic and eukaryotic polyribosomes (and ribosomes) differ in several ways, most importantly in size. This is not to be confused with polycistronic mRNA encoding more than protein, which occurs only in prokaryotes, and also recall that transcription and translation are coupled in prokaryotes, whereas transcription occurs in the nucleus and translation in the cytoplasm for eurkaryotes.

### Re: Questions on the PCAT

Posted: **Fri Dec 22, 2017 9:48 pm**

by **simsimjoey**

NS_Tutor_Sophia wrote:Hi simsimjoey,

Integration by parts is simply the reverse of the product rule for differentiation, which is covered in Chapter 32. Integration by parts is a low-yield topic that is unlikely to be tested on the PCAT. You can find all the topics that are tested on the PCAT here:

http://pcatweb.info/downloads/about/PCA ... eItems.pdf. Is there a specific question you would like to discuss? If by the substitution rules for derivatives, you are referring to the Chain Rule, that is definitely something you might see on Test Day and is also covered in Chapter 32.

Polyribosomes are indeed also found in eukaryotes, but prokaryotic and eukaryotic polyribosomes (and ribosomes) differ in several ways, most importantly in size. This is not to be confused with polycistronic mRNA encoding more than protein, which occurs only in prokaryotes, and also recall that transcription and translation are coupled in prokaryotes, whereas transcription occurs in the nucleus and translation in the cytoplasm for eurkaryotes.

Hi,

Was the formula for integration by parts on there..? There was a question that asked integrate x^2cosx from 1 to 2 but i don't remember seeing an explanation for integration by parts on the review book. Also, I found that there is the quotient rule on the review book is wrong ; there is a plus sign where it should be minus.

The question on the bio was " which of the following is common to both eukaryotes and prokaryotes?

a) polyribosome b) dna promoter c) rna splicing d) 3'poly A tail--> So...this should take a and b for its answer right?

### Re: Questions on the PCAT

Posted: **Sat Dec 23, 2017 11:36 pm**

by **NS_Tutor_Sophia**

Hi simsimjoey,

Since you are using the BETA version of the Review Book, it is possible that you may find errors that either have or will be corrected in the current print version of the Review Book. We apologize for any errors you may find, and if you think you have found an error, I would encourage you to submit your feedback to our content team at

pcat@nextsteptestprep.com.

Integration by parts is an advanced technique that is very unlikely to be tested on the PCAT, and thus this is not reviewed in the Review Book. If you would like to work one-on-one with one of our tutors on some of these more challenging math concepts, you are welcome to schedule a free consultation with one of our Academic Managers here:

https://nextsteptestprep.com/pcat-tutoring/
While not identical, you are correct in that polyribosomes can be found in both prokaryotes and eukaryotes. Our content team will review this question and make any necessary revisions to help avoid confusion. Thank you for your feedback on this question, and please do not hesitate in the future to submit feedback through the Feedback button in your exams or by sending an email to

pcat@nextsteptestprep.com.

Good luck with your prep!