Midcourse test pt 1

Question 1

q1 What is the magnification of the plant cell? I =50mm

Answer 1

2.0x10^3

Question 2

what bonds hold quaternary protein structure together? 2

Answer 2

hydrogen bonds and disulphide bonds

Question 3

What relationships could be investigated with a colorimeter? 2

Answer 3

The effect of high intensity on the rate at which a solution of light sensitive dye changes from green to colourless

The effect of temperature on the rate of breakdown of cell membranes in tissues with pigmented cells, such as beetroot

Question 4

Q4 read context, which statement correctly explains a response to ethanol that could account for the increase in tolerance of yeast cell membranes to ethanol?

Answer 4

Increasing the proportion of palmitoleic acid (a C16 unsaturated fatty acid) to oleic acid (a C18 unsaturated fatty acid) in the phospholipids of the bilayer increases fluidity of the cell membrane

Question 5

Q5 read context, what will happen in the second investigation after 5 minutes?

Answer 5

Water molecules will enter and leave the cell in equal amounts both at an initial rate that is less than R in the first investigation

Question 6

What does adenine pair with in DNA?

Answer 6

Thymine

Question 7

What does adenine pair with in RNA?

Answer 7

Uracil

Question 8

What does Guanine pair with?

Answer 8

Cytosine

Question 9

What bases are pyrimidines?

Answer 9

Uracil, thymine, and cytosine

Question 10

What bases are purines?

Answer 10

Adenine and guanine

Question 11

What type of bases are the DNA and RNA bases?

Answer 11

Nitrogenous

Question 12

Which bases have two rings in their structure?

Answer 12

adenine and guanine

Question 13

which bases have one ring in their structure?

Answer 13

Uracil, thymine and cytosine

Question 14

Q6 which statements about this nucleotide are correct? (can actually look at multiple choice)

Answer 14

1,2 and 3

Question 15

Q7 which description if the cross section of F correctly states what the students could actually see?

Answer 15

circular

Question 16

A student used Benedict’s solution to test a sample known to contain carbohydrate. At the end of the test, the solution was blue. Which carbohydrate could be present?

Answer 16

sucrose

Question 17

Q9 what sugar could be represented by the linear structure?

Answer 17

glucose

Question 18

Q10 which row describes protein structure?

Answer 18

C

Question 19

Draw the general structure of an amino acid

Answer 19

See Q 11 a

Question 20

Q11 b) calculate the rate of reaction when the standard brown colour was reached in 2 minutes 30 seconds

Answer 20

0.4

Question 21

Q11 b) ii) ( look at graph & read Q 11 b context on prev pg) state how the results shown in fig 11.3 show that the substrate was in excess at all concentrations of catechol oxidase tested

Answer 21

the line continues rising with each concentration and doesn’t reach a plateau