Bio 112 Exam 2 with Questions & 100%
Correct Answers
In an experimental procedure, the researcher has established multiple levels of a chemical, or amounts
of light, or some other factor at the beginning of the experiment, in order to determine if and how much
the biological system responds. The manipulated factor at varying levels is the
-independent variable.
-Both control group and standardized variable are correct.
-dependent variable.
-control group.
-standardized variable. - ✔✔-independent variable
Explanation
Choosing and establishing the correct variables is crucial to research, guided by relevance and whether
or not the experiment will allow testing of hypotheses. Read section 1.3.B for more information.
Review the section "Investigating Life: The Orchid and the Moth." Suppose that you are a scientist
comparing the energy that orchids use for developing flowers to the energy that orchids use to produce
nectar. Your research produces the following graph. These data make you curious if orchids that allocate
less energy to producing nectar (and therefore produce less nectar) reproduce less frequently. When
you set up your next experiment based on the information in this graph, what might be your
hypothesis?
-If orchids that produce less nectar do not reproduce, then we have proven the importance of high
nectar production.
-If orchids produce less nectar, then their moth pollinators will not visit them as often.
-If orchids produce less nectar, then moths will not like them as much and the orchids will be less likely
to reproduce. - ✔✔-If orchids produce less nectar, then their moth pollinators will not visit them as
often.
A researcher collected a single-celled organism from birdbath water and grew the organism in a
laboratory. The researcher observed the organism reproducing by cell division, which resulted in
identical offspring generations. This organism exhibits a form of
-asexual reproduction.
-reproduction occurring only in bacteria.
,-reproduction that produces enormous genetic diversity among offspring
-sexual reproduction, mixing genetic material from the parent cells.
-sexual reproduction of fungi. - ✔✔-asexual reproduction.
The hierarchy of life extends past individual organisms. Which of the following is the correct
sequence, from least inclusive to most inclusive, following an individual organism?
community - population - biosphere - ecosystem
population - community - ecosystem - biosphere
community - population - ecosystem - biosphere
population - ecosystem - community - biosphere
ecosystem - population - biosphere - community - ✔✔-population - community - ecosystem
- biosphere
What is NOT an example of an emergent property?
-Inside plant cells, chloroplasts capture energy from light and convert it to sugar, while
mitochondria harvest the energy from sugar and convert it to a molecule called ATP so that the cell
can use the energy.
-Each bacterial cell can carry out the processes of life on its own, whether it is isolated or among other
bacterial cells.
-Individual muscle cells can contract; heart muscle tissue is made up of cells that are connected in such a
way as to contract all at once, producing a "heartbeat."
-Working together, the heart, lungs, and blood vessels supply blood to every cell in the body. -
✔✔-Each bacterial cell can carry out the processes of life on its own, whether it is isolated or
among other bacterial cells.
Refer to the figure below, and then put the events on the left in the most logical order to explain
antibiotic resistance in a population of bacteria.
-The population of bacteria is exposed to antibiotics.
-Many bacteria that are not resistant to antibiotics die.
-A mutation conferring antibiotic resistance occurs in one or a few individuals in the population of
bacteria.
-The bacteria that are most resistant to antibiotics reproduce, passing their resistance genes to their
daughter cells.
,-The next generation of bacteria has more antibiotic resistant individuals than the previous generation. -
✔✔1.A mutation conferring antibiotic resistance occurs in one or a few individuals in the population
of bacteria.
2.The population of bacteria is exposed to antibiotics.
3.Many bacteria that are not resistant to antibiotics die.
4.The bacteria that are most resistant to antibiotics reproduce, passing their resistance genes to their
daughter cells.
5.The next generation of bacteria has more antibiotic resistant individuals than the previous generation.
A golfer wants a new set of clubs to improve her game. In an experiment, she goes to the driving range and
compares the distance she hits a bucket of golf balls with drivers of different materials in the clubs before
making her purchase decision. In this simple experiment, the standardized variable is the
-angle the ball was hit by the head surface of the club.
-all of these except the type of material used to make the club.
-force generated by her swing, when hitting the ball.
-type of material used to make the golf ball. - ✔✔-all of these except the type of material used
to make the club.
You are feeling ill, so you visit a physician. The physician takes your temperature, blood pressure, and
pulse and orders blood tests and urine analysis to determine more about your condition. The results of
all of these observations and tests will help the physician assess why your body is temporarily out of
"normal" conditions, or when the body is not adequately
-adapting.
-maintaining homeostasis.
-organized.
-reproducing.
-evolving. - ✔✔-maintaining homeostasis.
Which is the correct sequence of steps in the scientific method?
-form hypothesis - make an observation - design an experiment - collect data - analyze results
-make an observation - form hypothesis - design an experiment - collect data - analyze results
-make an observation - analyze results - draw conclusion - design an experiment - form hypothesis
, -form hypothesis - make an observation - collect data - analyze results - design an experiment
-make an observation - analyze results - form hypothesis - draw conclusions - design an experiment -
✔✔-make an observation - form hypothesis - design an experiment - collect data - analyze results
A college student has a new job, and must balance classes and commute times to work. The student
takes two weeks to drive from campus to the workplace by several routes, including a direct route
through town, a highway route, and a route through a city park. Comparing the drive times affected
by the route is possible. The dependent variable is the-
-distance in miles of each possible driving route from campus to workplace.
-the type of vehicle the student is driving.
-the time in minutes between walking from class to their vehicle.
-the number of cars in the same route.
-average time in minutes it takes to drive from campus to workplace. - ✔✔-average time in minutes
it takes to drive from campus to workplace.
The basic unit of classification in the taxonomic hierarchy, designating the organism "type," is the
-family.
-domain.
-kingdom.
-species.
-genus. - ✔✔species
organization - ✔✔cells make tissues, tissues make organs, organs make up organ systems
metabolism - ✔✔autotrophs use energy from the sun
homeostasis - ✔✔your body maintains an internal temperature of 37 degrees celsius
Reproduction, growth, and development - ✔✔going through puberty to reach maturity is part of
________.
