A couple whacky Biology and Chemistry questions (Urgent)

Factual Questions
1

Ok, so I had a biology assignment and I’m having trouble with a few questions. I have removed the obviously wrong answers to lessen the cluttering.

20. If you bent your right leg and arm, which of the options will represent your
elbow/knee?

a. single bond
b. saturated bond
d. hydrogen bond
e. double bond

21. Living things reproduce, respond to stimulus, etc. Can you tell what all living things can’t do from the list below, choose only one.

d. locomote
de. move

6. When you touched mimosa:

c. it proved that it can sense it
d. it emphasized that it can also move
e. it locomoted and said “touch me not”

4. Living things have different levels of efficiency, which of the given options has a lower photosynthetic efficiency than the other?

c. C-3 plants

**5. Based on your answer, under what conditions can it happen or not happen? **

a. hot/dry
c. sunny and wet
11. C - C - C - C = C - C - C = C - COOH, name that fat.

a. omega 4,7-polyunsaturated fat
b. omega 1, 4 - poly unsaturated fat
c. saturated fat
d. alpha 3, 3 poly unsaturated fat
e. omega 4,7 poly saturated fat
20: I don’t know…I’s a badly phrased question imho.

21: I thought locomoting and moving were the same thing…I know for a fact he expects me to pick one of the answers. I suppose he wants me to say that all living things locomote but google searches disagree…What do you think?

6: Again, a bad question. It certainly proved that it could sense me, it also closed up. Locomoted or moved? this is tied to the previous question.

4: Ok, I got the answer to that one. But check out number 5! it’s the worst question of the lot…

5: What the heck???

11: ok, this one is a simple, straightforward question. The thing is, we DID NOT study this in class!!! Google proved most unhelpful on this one. I’m guessing the answer is a
So there you have it. The teacher is not a bad teacher but some of his questions are really subpar. There were 43 questions in total. I answered all the others.

All *informed * opinions would be welcome.

Thank you for your time

-Recurriman

2

Is this how the questions were actually written?? We’re not missing any context for this? If so, I’m appalled at the lack of assessment skills your instructor seems to have.

#20 doesn’t make sense… are you supposed to assume your shoulder and knee are the carbon atoms in an alkene? Even so, it still wouldn’t make sense.

#21 locomote could mean movement caused by energy expended by the organism, while movement can be any motion (e.g. grass blowing in the wind), but that’s not really a useful distinction, IMHO.

#6 What? Mimosa? Champagne in orange juice? :confused:

Is #5 asking about #4? C4 plants are typically restricted to tropical areas, so sunny and wet sounds better to me.

#11 I don’t know - I last took biochemistry in 1996; can’t help you there except to tell you that it’s surely an unsaturated fat because there are double bonds present. I’d have guessed that the C in COOH would become the #1 carbon, but from the choices that’s obviously wrong.

3

Sorry. I should have said: did you speak to your teacher one on one about these questions? The clarity of writing them is surely an issue here, and not one we can resolve over the internet.

4

Hmm, we don’t usually do homework questions here, but since you seem to made a bona fide attempt at doing it yourself I guess it’s OK. It’s really OK when you realise just how poorly and incoherently they have been written. I pity you.

This is nearly incomprehensible. I’m guessing the answer is (e). My reasoning is thus.

The human torso is meant to represent the ‘normal’ single bond between two carbon atoms located notionally at the head and genitals. The limbs in turn represent free electrons/hydrogen covalent bonds. By bringing the knee and elbow closer together you are representing the formation of a covalent bond between the atoms, effectively a double bond.

The problem with this is that there are only four limbs, which suggests that the body represents ethylene to begin with, not ethane. In which case you already have a double bond and the movement of the limbs forms a triple bond, which isn’t an option.

The question really makes no sense, but e is less silly than a, b and d.

Answer is simple enough, it’s (d) locomote. Locomotion is movement from one location to another. While all living things are capable of movement of some kind many, such as plants, can’t move from place to place.

This is really silly. (c) and (d) are both equally correct. There is no possible way to say that either is more correct.

Umm, are you sure that the answer is C3? Again, I suspect the question is really badly written once again. C3 is no less efficient than C4 by the normal usage of the word efficiency, which is relative net product – relative net input. C3 plants tend to do better in colder climates and C4 in hot conditions, especially hot and dry.

But if the answer is C-3 plants then…

Can what not happen? The C3 pathway can ‘happen’ when it’s hot/dry or sunny and wet. I’m guessing the question is trying to ask under what conditions it doesn’t have lower photosynthetic efficiency, in which case you picked the wrong answer for question 4. The answer should have been C4 PHS, which has a higher energy cost for carbon fixation and is thus technically less efficient. However it is more efficient in hot dry conditions because of a greater ability to conserve water.

Alternatively the answer to question 4 may have been C3 PHS but in that case the answer to this question should be that it is more efficient in moist cool conditions.

Either way you’ve picked the wrong answers to eliminate in either 3 or 4.

Been 15+ years since I studied this and I’ve never used it since, so I’ll leave this to someone one else for the moment.

How do you know? Was C4 not an option?

5

That would be a. As far as why the carbon in the carboxylic acid group is not carbon number 1, well, it is. That’s the alpha carbon. The omega carbon is at the other end (omega being the last letter of the alphabet). As worded, we can count backwards from omega, and we number from the lowest numbered carbon in the double bond. So we have something like this:

C1 - C2 - C3 - C4 = C5 - C6 - C7 = C8 - C9OOH

That would be an omega-4,7-polyunsaturated fatty acid, or 9:2(delta4,7)

6

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I suggest you ask your teacher for clarification of the questions if that is what is needed.

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