NEED SOME HELP FOR EXAMS

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Offline farqueue

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NEED SOME HELP FOR EXAMS
« on: 10/11/2005 08:26:23 »
1. what is overwintering
2. what is apical dominance
3. what are some factors which prevent the mismatch of bases A, T, C, G bases from mismatching in DNA
 

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Offline DoctorBeaver

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Re: NEED SOME HELP FOR EXAMS
« Reply #1 on: 10/11/2005 20:26:12 »
quote:
3. what are some factors which prevent the mismatch of bases A, T, C, G bases from mismatching in DNA


It's down to the shape of the molecules. If the receptor isn't the correct shape, an incoming molecule can't dock. Think of it as putting your shoes on - your left foot can't fit in your right shoe & vice versa
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Offline farqueue

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Re: NEED SOME HELP FOR EXAMS
« Reply #2 on: 11/11/2005 08:26:42 »
What about the first two?
 

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Offline DoctorBeaver

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Re: NEED SOME HELP FOR EXAMS
« Reply #3 on: 11/11/2005 21:39:53 »
how the hell am I supposed to know? I'm a psychologist! [:I]
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Offline DoctorBeaver

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Re: NEED SOME HELP FOR EXAMS
« Reply #4 on: 11/11/2005 21:40:42 »
Isn't overwintering something to do with animal & bird migration?
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Offline DoctorBeaver

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Re: NEED SOME HELP FOR EXAMS
« Reply #5 on: 11/11/2005 21:43:29 »
Oh ok then, you've PLANTED the SEED of doubt in my mind so I'll tell you about apical dominance too.

Typically a shoot has leaves attached to a stem. The apex of the stem has an actively growing apical bud. It produces additional nodes and internodes to add to the length of the shoot. Additional leaves appear at the nodes as they are produced.

In some plants, the lateral bud located in the axil of each leaf does not grow to form branches, especially at first. This condition is known as strong apical dominance.

Apical dominance is thought to be caused by the apical bud producing IAA (auxin) in abundance. This auxin is transported basipetally from the apical bud. The auxin causes the lateral buds to remain dormant.

There.. happy now?
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Offline DoctorBeaver

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Re: NEED SOME HELP FOR EXAMS
« Reply #6 on: 11/11/2005 21:46:48 »
Thank you to http://http://koning.ecsu.ctstateu.edu/apical/apical.html for that last 1 [:D]

You really should learn to use Google, shouldn't you! heh [:p]
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