Biology JLAB UPDATED Exam Questions
and CORRECT Answers
Ascidians are sac-like marine organisms. Their larvae have well-developed brains and dorsal
nerve cords. This suggests that ascidians should be classified with the - - CORRECT
ANSWER - chordates
In order to maintain homeostasis, it is most important for an animal to be able to - - CORRECT
ANSWER - respond to its environment
A scientist develops a hypothesis, designs an experiment, and obtains data that support her
hypothesis. Which of the following best describes when a hypothesis becomes a theory? -
CORRECT ANSWER - When it is supported by consistent data from many experimental
trials
Which of these is a decomposer in a Virginia forest? - CORRECT ANSWER -a
mushroom
According to the classification key, what is the genus and species of this organism? - CORRECT
ANSWER - Eurytides marcellus
A population of mice is evenly divided into two groups, and each group is placed on an isolated
island with no existing mouse population. Which statement best explains the difference in the
mouse populations on Island A and Island B at the end of the 20 years? - CORRECT
ANSWER - Conditions on Island B favored the brown-furred individuals,
while both fur colors were evenly advantaged on Island A.
Lamarck was an early scientist who
studied the development of characteristics in
organisms over time. Which of the following
choices best describes his views on how
, organisms change over time? - CORRECT ANSWER - Theory of acquired characteristics
A certain virus causes a disease of the
digestive system. What is the most likely source of
this virus? - CORRECT ANSWER - water
Based on this classification scheme, the European otter and the leopard are in
the same — - CORRECT ANSWER - order but different families
Which area of the leaf is most
responsible for protecting the leaf from the
drying effects of the air? - CORRECT ANSWER - the cuticle
According to the data in the graph,
during which time period did the overall bluegill
population decline? - CORRECT ANSWER - 1996-1999
The picture shows the trachea and
surrounding tissue of a flea. Which of these
best describes the shape of the flea trachea? - CORRECT ANSWER - a long, branched
tube
The organisms at the beginning of the food chain are - - CORRECT ANSWER - producers
Two plants are crossed, and the traits of height and color are assessed in the offspring. The
following cross was conducted: TTPP × ttpp.
T = dominant allele for height, tall plant
t = recessive allele for height, short plant
and CORRECT Answers
Ascidians are sac-like marine organisms. Their larvae have well-developed brains and dorsal
nerve cords. This suggests that ascidians should be classified with the - - CORRECT
ANSWER - chordates
In order to maintain homeostasis, it is most important for an animal to be able to - - CORRECT
ANSWER - respond to its environment
A scientist develops a hypothesis, designs an experiment, and obtains data that support her
hypothesis. Which of the following best describes when a hypothesis becomes a theory? -
CORRECT ANSWER - When it is supported by consistent data from many experimental
trials
Which of these is a decomposer in a Virginia forest? - CORRECT ANSWER -a
mushroom
According to the classification key, what is the genus and species of this organism? - CORRECT
ANSWER - Eurytides marcellus
A population of mice is evenly divided into two groups, and each group is placed on an isolated
island with no existing mouse population. Which statement best explains the difference in the
mouse populations on Island A and Island B at the end of the 20 years? - CORRECT
ANSWER - Conditions on Island B favored the brown-furred individuals,
while both fur colors were evenly advantaged on Island A.
Lamarck was an early scientist who
studied the development of characteristics in
organisms over time. Which of the following
choices best describes his views on how
, organisms change over time? - CORRECT ANSWER - Theory of acquired characteristics
A certain virus causes a disease of the
digestive system. What is the most likely source of
this virus? - CORRECT ANSWER - water
Based on this classification scheme, the European otter and the leopard are in
the same — - CORRECT ANSWER - order but different families
Which area of the leaf is most
responsible for protecting the leaf from the
drying effects of the air? - CORRECT ANSWER - the cuticle
According to the data in the graph,
during which time period did the overall bluegill
population decline? - CORRECT ANSWER - 1996-1999
The picture shows the trachea and
surrounding tissue of a flea. Which of these
best describes the shape of the flea trachea? - CORRECT ANSWER - a long, branched
tube
The organisms at the beginning of the food chain are - - CORRECT ANSWER - producers
Two plants are crossed, and the traits of height and color are assessed in the offspring. The
following cross was conducted: TTPP × ttpp.
T = dominant allele for height, tall plant
t = recessive allele for height, short plant
