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1.1 Students learn to identify the role of enzymes in metabolism, describe their chemical composition and use a simple model to describe their specificity on substrates. Most people would know that some animals (like frogs, snakes and lizards) are a€?cold-bloodeda€? and that when the weather is cold, these animals are less active than when ita€™s warm. Each enzyme has a unique shape - it is this shape that means it will make just one reaction go. Enzymes are not usually used up in chemical reactions - they can be used over and over, so they can be present in tiny amounts. Enzymes are difficult to study in high school but there is one in saliva that we can study. Explain why our bodies need to make large amounts of digestive enzymes (like pepsin) but only tiny amounts of other enzymes (like hexokinase, which is present in every cell and catalyses the breakdown of glucose to glucose 6-phosphate).
This experiment is important to addressing the skills outcome H11 (a€?A student justifies the appropriateness of a particular investigation plana€?).
I hope you have a picture of many chemical reactions occurring in your own body right now, each one occurring because of the presence of tiny amounts of enzymes. So, it is important that the temperature and acidity in your body has to be kept at the right level.
Maybe you can think of some changes that occur in your body when the temperature gets too low! The first step to prevent your death is for your body to recognise the change in your body temperature.
I have only considered what happens when there is a danger of you over-heating but there are many aspects of your body that have to be kept constant - for example, oxygen, sugar and water levels in the blood.
Nerve impulses travel very quickly, and travel from one small part of the body to another small part. Hormones travel relatively slowly in blood, from an endocrine gland to a number of target organs.
An example might be the hormone adrenalin, travelling from the adrenal glands above the kidneys to skin (constricting blood vessels), the pacemaker in the brain (increasing heart rate), the liver (increasing the level of glucose in the blood) and many other organs. At the Mid-Atlantic ridge, a€?black smokersa€? raise the temperature of the ocean above 100oC without the water boiling (because of the very high pressure). There are other organisms that thrive in temperatures close to the freezing point of water.
The temperatures at which organisms are found and the range over which they can survive is because of the enzymes in their bodies. A Grylloblattid - (Grylloblatta bifratrilecta) an insect related to crickets and cockroaches that lives in snow.


Leta€™s make our ectotherm the impressive but relatively harmless (if left alone) Red-bellied Black Snake (Pseudechis porphyriacus). Comparing our ectoderm (Black Snake) and endoderm (Wombat) it is clear that both have behaviours and bodies that help them to survive extremes. Your textbook does not give any examples of plants responding to temperature change - only adaptations to temperature extremes -so Eucalypts have drooping leaves which helps them to avoid overheating when the Sun is high; deciduous trees drop their leaves which helps them to avoid frost damage. Responses of plants to temperature change are not common but there has been great interest from horticulturalists over several hundreds of years in the ability of Rhododendron spp to curl their leaves in response to temperature change. Most people would know that some animals (like frogs, snakes and lizards) are a€?cold-bloodeda€? and that when the weather is cold, these animals are less active than when ita€™s warm.A  Why is this? Enzymes are not usually used up in chemical reactions - they can be used over and over, so they can be present in tiny amounts.A  But most importantly, they only work under special conditions - a narrow temperature range and a narrow pH (acidity) range.
That usually doesna€™t happen because things happen in your body to cool your body.A  You sweat, surface veins open up so that blood flows closer to the cooling air, and you breathe more often releasing warm our from your lungs. This is a practical investigation involving second-hand research.A  Before you start it, you should read these notes. I have only considered what happens when there is a danger of you over-heating but there are many aspects of your body that have to be kept constant - for example, oxygen, sugar and water levels in the blood.A  For each, there are receptors that detect the changes and a control centre (usually in the brain) that counteracts the change. Nerve impulses travel very quickly, and travel from one small part of the body to another small part.A  An example might be from a fingertip to a very small part of the brain when we touch something. There are other organisms that thrive in temperatures close to the freezing point of water.A  For example, there are bacteria-like cells that grow on snow turning it red (to produce a€?watermelon snowa€?).
On the other hand, individual organisms can generally survive in a fairly narrow range.A  For example, tropical fish die in cold water, yet antarctic fish would die in tropical waters. Choose an ectothermic animal species, an endothermic animal species and a plant species.A  Dona€™t forget the advice about second-hand research, especially to acknowledge your sources.
Your textbook does not give any examples of plants responding to temperature change - only adaptations to temperature extremes -so Eucalypts have drooping leaves which helps them to avoid overheating when the Sun is high;A  deciduous trees drop their leaves which helps them to avoid frost damage. However, because it can maintain its body temperature within a narrow range, wombats can remain active over a much wider temperature range. I heard a big rumbly truck driving down the street and looked to see what it was and realized they were stopping in front of our house! She did miss a day of day care but it resolved within a few days and she's back to her normal self. Some recent activities have been strawberry picking, a family festival complete with rides, face painting, and a pie eating contest, and something called Free Fun Fridays where there is free entrance to select museums on Fridays throughout the summer.I also get good tips from daycare, Miss Christine mentioned that there is a place near here that is an indoor play area that includes a miniature grocery store, craft area, miniature post office. Too bad the weather has been complete crud since it was put in and we haven't been able to use it.


Anyway, we got walloped with the surprise Nor'easter last week and my whole town basically lost power. I can pretty much just look at it to be able to tell what to do so I think I'll whip this up for her to wear in Fall. We bought a fire pit and we have a little bistro set that we used on the deck of our previous apt.
I didn't have any make up on and still had my jams on which is ok because it was just a tank top and yoga pants.With all of the planning for M's birthday, I really forgot about it.
They have an infant play area but it's pretty much what our library has but I'm curious to see what the place is all about and to see if it's something we might revisit as she gets older. And it's not like I planned anything major, it was mostly just forcing him to finally decide on his birthday meal and dessert, but I guess between birthday planning, mothering, working it slipped through the cracks. On top of that, we desperately need to get to Costco today, we are running out of diapers and wipes! We tried to revive her with a feeding but she was pretty much all set with the fishies for the day.
I was very uninspired by anything at Target this year and knowing she wouldn't be going trick or treating didn't help me in the motivation department to venture beyond Target's red walls. After being gouged $18 for parking, and that was the validated rate, we headed home to pack for the other adventures of the weekend. I think A will have fun answering the door and seeing the other kids; I think she'll be ready to go next year. Most of M's extended family have not met A yet, so the whole family was coming over on Sunday.
She was great in the car, pretty much slept the whole way, waking up just before our usual pit stops and then falling right back to sleep when we got back in the car. The naps in the pack and play were dicey the first day, and she cried off and on for the first hour after going down for the night but then she was fine.
The next day, she napped much better, charmed the pants off all of the family, and avoided her usual day 2 meltdown. She went to bed without any issues and actually slept straight through ( I think part of the reason for the success is that she can't drop the pacifier out of the side of the pack and play like she does with the crib).
The ride home was fine, she slept for only 45 minutes of it, but I sat in back and played with her and we successfully avoided any major meltdowns.



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