128 What is the volume of water in the graduated cylinder shown below?

(1) 10.3 mL        (3) 13.5 mL
(2) 13.0 mL        (4) 14.0 mL

129 the red blood cells from 100 different human blood samples were studied. All the red
blood cells observed lacked nuclei. From this study, the investigator concluded that the red
blood cells of all vertebrate animals do not contain nuclei. Using one or more complete
sentences, state whether or not this conclusion is valid and explain the reason for your
 answer. You may use pen or pencil for your answer.

GROUP 4

If you choose this group, be sure to answer questions130-134.

130 The controlled experiment shown in the diagrams below is testing the
effect of vitamin D on the growth of E.coli bacteria.

Using one or more complete sentences, state one error in the experimental
setup. You may use pen or pencil for your answer.

131 The chart below lists characteristics of five species of bacteria.

An unknown organism has a type A cell wall, a capsule, flagella, and endospores. The
organism is aerobic and ferments glucose, lactose, and maltose. It does not cause red blood
cell lysis and does not grow well at 20^oC. Based on the chart, the best conclusion that can
be drawn is that this organism is

1 closely related to Diplococcus pneumoniae
2 Bacillus anthracis
3 Bacillus subtilis
4 not identifiable from the information given

132 The materials from four different laboratory investigations are listed
below.

Select one of the four sets of materials. Record the number of the set chosen in the space
provided on your answer paper and, using one or more complete sentences, state a
laboratory investigation that could be carried out using this set. You may use pen or pencil
for your answer.

133 An investigation was set up to determine the effect of various surfaces on the amount
of time it takes a snail to move between two points. A ramp was made, covered with a
piece of glass, and placed on a table at a 25-degree angle. Two lines, 15 centimeters apart, |
were drawn on the glass. A snail was placed on the upper line, and a stopwatch was used
to measure the amount of time it took the snail to move to the lower line. The results were
recorded in a data table. The investigation was repeated using sandpaper and cardboard
on the surface of the ramp.

What must be done to show that the results of this investigation are valid?

1 The angle of the ramp must be increased to 35 degrees.
2 The times in the data table must be averaged.
3 The investigation must be repeated several times.
4 The ramp must be replaced with a log found in the habitat of the
snail.

134 When heating a solution in a test tube, a student should

1 point the test tube in any direction
2 hold the test tube with two fingers
3 cork the test tube
4 wear goggles

END OF EXAM

<< Previous Page Answer Key >>