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AP biology multiple choice questions

Blogs > clazziquai
Post a Reply
clazziquai
Profile Blog Joined October 2007
6685 Posts
May 02 2008 04:19 GMT
#1
I was given a multiple choice practice test and these questions bother me.


Which of the following is the most direct result of the presence of acid chyme in the small intestine?

A) The liver produces insulin
C) The stomach produces pepsin

A or C?
I eliminated out the wrong choices ( i think )

In animals, all of the followign are associated with embyronic development except:
A) Migration of cells to specific areas
B) Formation of germ layers
C) Activation of all the genes in each cell
D) Inductive tissue interactions
E) Cell division at a relatively rapid ratenk this is it)

#1 Sea.Really Fan / #1 Nesh Fan / Terran Forever~
Wasabi
Profile Blog Joined August 2006
United States3085 Posts
Last Edited: 2008-05-02 04:32:17
May 02 2008 04:28 GMT
#2
--- Nuked ---
clazziquai
Profile Blog Joined October 2007
6685 Posts
May 02 2008 04:29 GMT
#3
On May 02 2008 13:28 Wasabi wrote:
For the first question, C.

When pepsin converts the food it turns into a liquid-like substance which is the acid chyme.

I remember this info. when I took AP Bio when I was in 2nd year high high school.


Thank you, wise one.
#1 Sea.Really Fan / #1 Nesh Fan / Terran Forever~
EmeraldSparks
Profile Blog Joined January 2008
United States1451 Posts
May 02 2008 04:35 GMT
#4
Second question, C.
But why?
Gandalf
Profile Joined August 2004
Pakistan1905 Posts
May 02 2008 04:38 GMT
#5
I'd like to see all options for the first question before I give you the answer. Keep in mind that the question notes the presence of acidic chyme in the SI, and not the stomach.

For the second, are you thinking the last option is correct? Rapid cell division is obviously associated with embryonic development, since a single cell repeatedly divides to form a fetus. The correct answer is C. Since all cells of a fetus derive from the same cell, they will all have the same DNA. The only way cells can move along different pathways of differentiation, and hence form different types of cells and organs, is for some genes to be selectively turned off (its more complicated than this). The genes that control this are called HOX genes, if you're interested in reading more.

Slaughter
Profile Blog Joined November 2003
United States20254 Posts
Last Edited: 2008-05-02 04:58:23
May 02 2008 04:47 GMT
#6
Gandalf pretty much has it wrapped up, but I agree with him on the 1st question tho, because pepsin is triggered when the acid enviroment of the stomach converts pepsinogen into its active form (pepsin) so why would the stomach secrete pepsin when acid chyme is in the SI? The presance of acid chyme is supposed to trigger an alkaline soulution to neutralize the acid being secreted along with other enzymes. Plus the liver doesnt secrete insulin
Never Knows Best.
talismania
Profile Blog Joined December 2007
United States2364 Posts
Last Edited: 2008-05-02 04:55:43
May 02 2008 04:55 GMT
#7
pro-tip: the pancreas produces insulin, not the liver.

also I agree, I think you should include the other options.

and the other people are right that the second question is C.
intrigue
Profile Blog Joined November 2005
Washington, D.C9934 Posts
Last Edited: 2008-05-02 05:01:16
May 02 2008 05:00 GMT
#8
both are pretty ezly c
edit: wow it's been a long time since ap bio
Moderatorhttps://soundcloud.com/castlesmusic/sets/oak
Slaughter
Profile Blog Joined November 2003
United States20254 Posts
May 02 2008 05:02 GMT
#9
for me its been 6 years lol.
Never Knows Best.
Wasabi
Profile Blog Joined August 2006
United States3085 Posts
May 02 2008 05:05 GMT
#10
--- Nuked ---
Slaughter
Profile Blog Joined November 2003
United States20254 Posts
Last Edited: 2008-05-02 05:18:15
May 02 2008 05:17 GMT
#11
The question reads it backwords tho, as if the presance of acid chyme triggers the production of pepsin which is not the way it should be worded. Out of those 2 choices tho C is the obvious choice. I still would rather see the other choices tho.
Never Knows Best.
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