BIOL 103 Quiz II WITH CORRECT
ANSWERSBIOL 103 Quiz II WITH CORRECT
ANSWERSBIOL 103 Quiz II WITH CORRECT
ANSWERSBIOL 103 Quiz II WITH CORRECT
ANSWERSBIOL 103 Quiz II WITH CORRECT
ANSWERS
A change in what component of microscopy influences the apparent size of the objects
being viewed? - CORRECT ANSWERS-Magnification
A given enzyme works on - CORRECT ANSWERS-one type of substrate.
A group of three nucleotides acts as a "code word" or template for making - CORRECT
ANSWERS-one amino acid.
A negative control is a sample that you know will give you a negative result. You are
testing for the presence of proteins, simple sugars, starch, and lipids in various foods.
What would be the best negative control for this experiment? - CORRECT ANSWERS-
Distilled water, because it does not contain any of the molecules you are testing for.
A small amount of lipase, called gastric lipase, is made by cells in your stomach. The
average temperature of the stomach is 37oC(98.6oF). This enzyme specifically digests
butterfat in your food. Lipase is an enzyme that breaks down dietary fats into smaller
molecules called fatty acids and glycerol. This enzyme was extracted by Jane and
added to butter (a fatty food), then left on ice for thirty minutes. The reaction did not
occur. What property of enzymes explains why the reaction did not occur? Also was this
a catabolic or anabolic reaction? Explain. - CORRECT ANSWERS-Gastric lipase
operates/reacts in temperatures at or near 37 degrees Celsius--the average
temperature seen in the stomach where the enzyme originates--and potentially reacts
even faster at higher temperatures up to a certain point. So, exposing the enzyme to
lower, colder temperatures via leaving butter-added enzyme on ice for thirty minutes will
not yield a reaction. As lipase breaks down dietary fat into smaller molecules called fatty
acids and glycerol, this reaction can be seen as a catabolic reaction. (Catabolism
breaks down complex molecules into simpler ones).
The reaction did not occur because enzymes are sensitive to environmental conditions.
In this case, the temperature was too cold. This enzyme needs a temperature around
that of human body temperature to function optimally. This is a catabolic reaction
because better fat is broken down into fatty acids and glycerol.
, A student is designing an experiment about cell size in organisms of different sizes. Her
hypothesis is that larger organisms will have larger cells. She collects cheek cells from
five different students in her class and estimates their size under the microscope. -
CORRECT ANSWERS-height of human students
A valuable artifact has been stolen from the museum (Case: Museum Theft). The three
suspects each claim they were never at the museum at all, but they have shaky alibis.
Investigators found DNA evidence on the scene from a coffee cup (Sample 1) and
discarded chewing gum (Sample 2). - CORRECT ANSWERS-After comparing the DNA
fingerprints from the two samples to the three individuals, you conclude that Sample 1
matches Individual C and Sample 2 matches Individual C.
After focusing on an object with the low power objective lens, you are trying to bring it
into focus under the 40x objective lens, but the field of view is very dark. Which of the
following may remedy this problem? - CORRECT ANSWERS-Increase the light
intensity.
Anticodon - CORRECT ANSWERS-The part of a tRNA that matches a codon
Applications of transgenic organisms - CORRECT ANSWERS-Transgenic organisms
are utilized for many applications. In agriculture, transgenic plants contain genes that
make them frost, drought, pest, and disease resistant. In medicine, the human insulin
gene is inserted into bacteria. These bacteria grow and divide rapidly, expressing large
quantities of this protein. We then harvest this insulin product and use it for the
treatment of diabetes.
Archaeologists working on the Island of Ambrosia made a discovery of ancient human
remains (Case: Lost Prince). Local islanders believe that these represent the Lost
Prince of Ambrosia. Thanks to local funerary customs and the islands' unique climate,
you have been able to extract DNA from the mystery remains as well as the remains
from the former King and Queen, parents of the lost prince. There is also DNA available
from unrelated Islanders (male and female). After analyzing these samples, what do you
conclude? - CORRECT ANSWERS-The human remains are the Lost Prince, son of the
King and Queen.
As the amount of substrate is increased in an enzyme-substrate reaction, - CORRECT
ANSWERS-the amount of product increases.
Codons - CORRECT ANSWERS-Three nucleotides that each stand for one specific
amino acid
Complete the calculations for total magnification produced by various combinations of
the eyepiece and objective lenses. Remember, to calculate the total magnification
achieved when using a particular objective, multiply the power of the eyepiece by the
power of the objective used. - CORRECT ANSWERS-- When the scanning (4x)
objective is used the total magnification will be 40x.
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