Tutor.com Inheritance Session

Mar. 14, 2012

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Session Transcript - Science - Biology, 3/4/2012 9:57PM - Tutor.comSession Date: 3/4/2012 9:57PM
Length: 44.8 minute(s)
Subject: Science - Biology


System Message
[00:00:00] *** Please note: All sessions are recorded for quality control. ***

Alexis (Customer)
[00:00:00] please check my answers [ File > http://lhh.tutor.com/SharedSessionFiles/ad077fa2-478c-4f50-9965-729adfe56993_weekly_worksheet_4%5b1%5d.doc ]

Lumeng Y (Tutor)
[00:00:13] Welcome to Tutor.com ! Let's get started.
[00:00:26] hi! let me take a minut to look at the file

Alexis (Customer)
[00:00:26] hello.

System Message
[00:00:33] *** Downloading file from Lumeng Y (Tutor)... ***

Alexis (Customer)
[00:01:01] can you look over my wk sheet and tell me the ones that are incorrect. I will then work on the ones that are wrong

Lumeng Y (Tutor)
[00:01:30] sure give me a minute

System Message
[00:02:08] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Lumeng Y (Tutor)
[00:03:21] not done with the whole thing yet, but look at 7 again first

Alexis (Customer)
[00:03:36] ok
[00:04:26] my next choice for 7 would be "D"
[00:04:50] off the top of my head if that is incorrect i will refer back to my text

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[00:05:02] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Lumeng Y (Tutor)
[00:05:04] okay good! That should be correct

Alexis (Customer)
[00:05:08] oops e
[00:05:15] "E"

Lumeng Y (Tutor)
[00:05:19] hm?
[00:05:34] okay, why do you think it is E?

Alexis (Customer)
[00:05:43] i apologize D is my next choice for number 7

Lumeng Y (Tutor)
[00:05:50] right
[00:05:52] okay yes haha
[00:05:55] D is correct
[00:06:06] do you know why that is the answer?
[00:06:09] rather than E?

System Message
[00:06:38] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Alexis (Customer)
[00:06:42] Great!

Lumeng Y (Tutor)
[00:07:02] yes do you know why it's D and not E?

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Lumeng Y (Tutor)
[00:08:21] okay next look at 15 when you're ready
[00:08:59] and 18 you left blank, I'm not sure if you didn't know it or just skipped it by accident?

Alexis (Customer)
[00:09:04] yes. because homlogous chromosones vary in DNA, this is called alleles

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[00:09:18] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Lumeng Y (Tutor)
[00:10:14] okay good, and also you know that the location of genes is pretty much the same in everyone in the same species right? about the same...as my chromosome 1 has the same genes as your chromosome 1, except not the same alleles...so yes, D is the correct answer.
[00:10:20] look at question 15

Alexis (Customer)
[00:11:21] ok 15 D?

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Lumeng Y (Tutor)
[00:11:40] yes D is correct for 15.
[00:12:02] what occurs on the ribosomes?

Alexis (Customer)
[00:12:10] yay!

Lumeng Y (Tutor)
[00:12:16] =)

System Message
[00:12:30] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Lumeng Y (Tutor)
[00:12:38] okay how about 18 now?

Alexis (Customer)
[00:13:53] my first answer would be c?

Lumeng Y (Tutor)
[00:14:18] yes, but remember your answer from 15?
[00:14:24] transcription occurs in the nucleus?

Alexis (Customer)
[00:14:28] yes

Lumeng Y (Tutor)
[00:14:38] right, that is also an answer choice

Alexis (Customer)
[00:14:53] oh so it is E!

Lumeng Y (Tutor)
[00:14:55] and i think we also answered before that RNA polymerase was required?
[00:14:58] yup! good job

Alexis (Customer)
[00:15:08] thank you!

Lumeng Y (Tutor)
[00:15:13] now look at 21 and 22

Alexis (Customer)
[00:15:47] ok
[00:16:15] is 21 d?

System Message
[00:16:32] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Lumeng Y (Tutor)
[00:16:49] well, look again, this is an mRNA sequence we are talking about and what does D start with...?

Alexis (Customer)
[00:17:21] t but there are no T in mRNA...right?
[00:17:36] T has to be U? i get confused with these

Lumeng Y (Tutor)
[00:17:46] yes, it has to be U in mRNA

Alexis (Customer)
[00:18:17] I am sorry i have to use restroom..BRB

Lumeng Y (Tutor)
[00:18:26] sure

Alexis (Customer)
[00:20:09] ok i am back

Lumeng Y (Tutor)
[00:20:14] okay

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[00:20:26] *** Lost connection from Alexis (Customer). Waiting for reconnect... ***

Alexis (Customer)
[00:20:37] so, am i understanding correctly

Lumeng Y (Tutor)
[00:20:45] yes U in mRNA

Alexis (Customer)
[00:21:12] so the answer has to be C

Lumeng Y (Tutor)
[00:21:24] yes, correct!

Alexis (Customer)
[00:21:29]

Lumeng Y (Tutor)
[00:21:34] the answer you had before wasn't complementary
[00:21:40] good job
[00:21:42] now look at 22

Alexis (Customer)
[00:22:10] ok my first choice for 22 was A...but I seconf guessed myself.

Lumeng Y (Tutor)
[00:22:31] well, the second guessing was correct, but neither of the two were correct
[00:22:45] the 2 strands of DNA are held together by H bonds right?
[00:22:54] so it's not A

System Message
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Lumeng Y (Tutor)
[00:23:16] and, I'm not sure codon bonds exist
[00:23:29] so we're left with 3 choices
[00:23:54] which of the 3 left do you think it is?
[00:25:28] do you know what anticodons are?
[00:25:31] and the wobble effect?

Alexis (Customer)
[00:26:01] im sorry i was pulled away for a sec. let me get caught up
[00:26:48] ok my 3 choice is b..only bc i have it alot in this section.
[00:27:13] I thought wobble effect was a mutation. again guessing

Lumeng Y (Tutor)
[00:27:23] okay B is correct
[00:27:31] so you know that the anticodon is the 3 bases on the tRNA right?

Alexis (Customer)
[00:27:34] Great
[00:27:52] right!

Lumeng Y (Tutor)
[00:28:27] and the wobble effect does have to do with mutation in that the last base is usually degenerate, so even if the last base didn't match perfectly between the codon/anticodon, it would still put in the same amino acid
[00:28:31] okay good
[00:28:44] now look at 28

Alexis (Customer)
[00:29:10] ok
[00:30:31] so it is ATT-TAA and the UAA?
[00:30:55] again a lil confused

Lumeng Y (Tutor)
[00:31:12] if DNA is ATT
[00:31:24] then RNA is complementary, but with a U wherever there normally would be a T
[00:31:41] so yes it's UAA

Alexis (Customer)
[00:31:59] okay so B is the correct answer?

Lumeng Y (Tutor)
[00:32:26] I think you got it just don't second guess too much and remember that RNA uses U and not T. and yes B is correct =)
[00:32:52] why don't you try 31 next, you left it blank

Alexis (Customer)
[00:33:46] my first guess is c

Lumeng Y (Tutor)
[00:34:19] okay, good shot =P mRNA is used to make proteins, and that process is called....?

Alexis (Customer)
[00:34:58] translation?

Lumeng Y (Tutor)
[00:35:03] yes!
[00:35:05] good

Alexis (Customer)
[00:35:07] ahhh!

Lumeng Y (Tutor)
[00:35:13] remember that DNA -> mRNA is transcription
[00:35:22] but mRNA -> polypeptide is translation
[00:35:35] don't jump straight to transcription as soon as you see mRNA haha

Alexis (Customer)
[00:35:54] ok..makes sense

Lumeng Y (Tutor)
[00:36:11] okay! last one!
[00:36:12] 32

Alexis (Customer)
[00:36:30] okay i was thinking E

Lumeng Y (Tutor)
[00:36:44] E isn't a choice haha

Alexis (Customer)
[00:37:13] oops wrong one..lol
[00:37:17] B

Lumeng Y (Tutor)
[00:37:32] okay, that's close

Alexis (Customer)
[00:37:47] grrr....LOL. SORRY

Lumeng Y (Tutor)
[00:38:03] codons do specify polypeptides, but the question is asking about a SINGLE codon

Alexis (Customer)
[00:38:06] it has to be A

Lumeng Y (Tutor)
[00:38:51] ah haha don't rush, I think you know the concept, but just read the question more carefully. we're talking about a single codon, specifies a....?
[00:39:05] (an)

Alexis (Customer)
[00:39:22] C

Lumeng Y (Tutor)
[00:39:27] right!

Alexis (Customer)
[00:39:36] you helped with that one
[00:39:57] ok can i break that down so...i can endure i understand

Lumeng Y (Tutor)
[00:40:07] sure

Alexis (Customer)
[00:41:09] so is it Protien-polypeptide- mRNA-amino acid

Lumeng Y (Tutor)
[00:42:15] DNA->mRNA (codon) -> amino acid (via tRNA with anticodon, carrying an amino acid) -> polypeptide -> protein (folded polypeptide, and could be more than one)

Alexis (Customer)
[00:43:04] O-K! I will study that one.
[00:43:07]

Lumeng Y (Tutor)
[00:43:27] Do you have any other questions about anything we went over today?

Alexis (Customer)
[00:44:12] no, i really appreciate all your help. you might see me again. I have two more packets that I am working on

Lumeng Y (Tutor)
[00:44:31] haha okay sure =) Thanks for using Tutor.com. Please fill out the survey as you leave so we can learn how we can better help you in the future! 

Alexis (Customer)
[00:44:42] Just added you to my favorites
[00:44:53] will do!

Lumeng Y (Tutor)
[00:44:57] thanks!
[00:45:22] okay, bye then!

Alexis (Customer)
[00:45:38] bye!