BIOL 198 Exam 1
In class, you used a spectrophotometer to measure the absorbance of a sample of yeast cells. What
characteristic of the yeast sample can be directly estimated by absorbance? - Answer-The density of
yeast cells present.
When observing a slide on the microscope, which of the following lens powers should you use first? -
Answer-4X
Assume that you measure the absorbance of a new water sample containing bacteria. Using the
standard curve at right, how many bacteria per mm3
would be in your sample if the absorbance were 0.15? - Answer-about 17
There is supposed to be a graph
"Monarch butterflies migrate south for the winter because they don't like cold weather." Is the previous
statement an appropriate scientific hypothesis? Why or why not? - Answer-No. There is no way to
measure whether butterflies like or dislike something.
A scientific theory... - Answer-is a broad concept that can be tested experimentally but that also has a
great deal of prior evidence supporting it.
A researcher sets up an experiment looking at the effects of increased calcium on the growth of lizards.
One group of lizards is given food coated in powdered calcium. Another group is given food without
calcium added. The second group (without calcium) is called ____________. - Answer-a control
In class, you used a spectrophotometer to measure the absorbance of a sample of yeast cells. What
characteristic of the yeast sample can be directly estimated by absorbance? - Answer-The density of
yeast cells present.
When observing a slide on the microscope, which of the following lens powers should you use first? -
Answer-4X
Assume that you measure the absorbance of a new water sample containing bacteria. Using the
standard curve at right, how many bacteria per mm3
would be in your sample if the absorbance were 0.15? - Answer-about 17
There is supposed to be a graph
"Monarch butterflies migrate south for the winter because they don't like cold weather." Is the previous
statement an appropriate scientific hypothesis? Why or why not? - Answer-No. There is no way to
measure whether butterflies like or dislike something.
A scientific theory... - Answer-is a broad concept that can be tested experimentally but that also has a
great deal of prior evidence supporting it.
A researcher sets up an experiment looking at the effects of increased calcium on the growth of lizards.
One group of lizards is given food coated in powdered calcium. Another group is given food without
calcium added. The second group (without calcium) is called ____________. - Answer-a control
