Lower Secondary Science
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Dr.Daniel:
An envelope on a virus is on the exterior. The outermost layer on some viruses. It is made up of material from the host cell membrane. Some viruses like influenza use this strategy, but other viruses do not have an envelope. So it can be used as a way of classifying a virus.
Thank you., Dr Daniels....
Would appreciate it as I need help for the following questions:
1,The enzyme in pineapple soften meat before cooking. What enzyme function in a similar way in human body? Just to confirm if the answer is 'protease' since meat is protein? or should it by amalyse?
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)? -
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 Oā 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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