Lower Secondary Science
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Verysuperkiasu:
Right, protease. Protease in the human body works on proteins (found in meat), amalyse breaks down starch into sugars.
1,The enzyme in pineapple softens meat before cooking. What enzyme functions in a similar way in the human body? Just to confirm if the answer is 'protease' since meat is protein? or should it by amalyse? -
Verysuperkiasu:
Were they asking which is not true?
2.Which of the following is true?
a) Bacteria can produce spores.
b) fungi can reproduce by sexual reproduction
c) All viruses have the same capsid symmetry.
Is the answer c)?
a) true
b) true
c) not true -
Dr.Daniel:
ds can't recall - it was one of his exam questions. BTW, I thought only fungi reproduce by spores.
Were they asking which is not true?Verysuperkiasu:
2.Which of the following is true?
a) Bacteria can produce spores.
b) fungi can reproduce by sexual reproduction
c) All viruses have the same capsid symmetry.
Is the answer c)?
a) true
b) true
c) not true
Thanks anyway! -
Fungi use spores, but some bacteria do also - they are called endospores. Some were found in the tombs of the Eqyptian Pharoahs and when placed in the right environment, they produced the bacteria again. So they are amazingly resilient and can survive for even thousands of years.
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Dr.Daniel:
Fungi use spores, but some bacteria do also - they are called endospores. Some were found in the tombs of the Eqyptian Pharoahs and when placed in the right environment, they produced the bacteria again. So they are amazingly resilient and can survive for even thousands of years.
That's interesting piece of information, I must say. Didnt know that before but now I know...thank you for sharing!
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Dr.Daniel:
Got it. Thank you!Gems:
Sorry, we still don't understand the 1st question. How to derive at 1.39? Multiply out could not get the area too. Thanks.
360,000 Pa = 5N/Area
Area = 5N/360,000Pa = 1.39 X 10-5 square meters
Pa is N/m2
there are 100 cm in 1 meter, but 10000 cm2 in a m2. So to convert to cm2 multiply by 10,000 to get 0.139 cm2. -
Sorry to sidetrack, anyone had kids in Mindstretcher during PSLE in 2011?
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Dear Physics Students,
Check out fuchunphysics.wordpress.com
This blog contains teaching videos for Physics O’ Level syllabus.
Chapters uploaded include:
1) Measurements
2) Kinematics
3) Dynamics
4) Mass, Weight and Density
5) Turning Effect of Force
6) Energy, Work and Power
7) Pressure
Kinetic model of matter
The teaching videos for the remaining chapters will be posted soon. -
This thread has been very informative. Thanks all!
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Which of the following statements is true?
A)Bacteria cannot form spores
B) Fungi can only reproduce sexually.
C) All viruses have the same capsid symmetry.
D) Protocists like Amoeba and Paramecium are motile.
Answer : D. Why?
2) Object X has a melting point of 150 deg C and a boiling point of 350 deg C. In which of the following conditions does object X have the lowest density?
A) Object X at 0 deg C C) Object X at 350 deg C
B) Object X at 349 deg C D) Object X at 351 deg C
Ans : D. Why?
3)Why do telephone wires in some countries snap on very cold nights?
A) The telephone wires expand when temp is low.
B) The wires were not given enough slack when they were first installed?
C) The wires were given too much slack when they were first installed?
D) The wires reached their melting point on cold nights.
Ans: B. I can understand B if they mention wires snap on hot days, but on cold nights, shouldn’t wires contract? If so, why should they snap on cold nights?
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