1. A student view some unicellular freshwater algae under the microscope. He adds drops of concentrated salty water. He would expect it to
A. shrivel up and die
B. swell up and burst
C. lose its water and die
D. increase in its mass (C)
2. Experimentally, it is found that the rate of metabolism of a rat is higher than that of an elephant. How can you account for this experimental finding?
A. Rate of heat loss is directly proportional to body size
B. Structures of small mammals are simpler than that of larger mammals so the conservation of heat is poor in the former.
C. small mammals have bigger surface area to volume ratio so more heat is lost.
D.Small mammals, due to their body size, are much less active. (C)
3. Which of the following statements is true about proteins?
A. They pass easily through cell membranes.
B. Found in all living cells. (B)
My answers are written in brackets. Just need to double-check. Please inform me if there are errors. Appreciate your help!
Looks correct to me.
Question 1 is.. A. Shrivel up and die.
Microscopy is for observation. You can't see the loss of water molecule from the microscope, BUT we know that what cause the shrivel up is the loss of water.
Shrivel up has the same meaning as shrink.
Question 2 is..C. correct.
Question 3 is.. B. Correct.
Question 1
The choices look crappy to me.
(A) is the correct answer
But a better choice would be
"plasmolysed and died"
Originally posted by Darkness_hacker99:Question 1 is.. A. Shrivel up and die.
Microscopy is for observation. You can't see the loss of water molecule from the microscope, BUT we know that what cause the shrivel up is the loss of water.
Shrivel up has the same meaning as shrink.
Question 2 is..C. correct.
Question 3 is.. B. Correct.
you can't see the loss of water molecule from the microscope
Ya hor, stupid me
Tricky question >.<