BIOLOGY 211 EXAM 1 - IOWA STATE
UNIVERSITY
70+ (Fully Updated 2026) Exam Questions + Verified & Rationalized Answers
| A+ Graded
100% Guarantee Pass
📋 DOCUMENT OVERVIEW 73 Qs
This document, "Biology 211 Exam 1 - Iowa State University," covers fundamental biology concepts,
including cell theory, traits of life, biological information, genetics, and evolution. It provides a
comprehensive review of these topics through 73 questions with correct answers and detailed
explanations, along with diagrams and images. This study resource enables students to deepen their
understanding of biological concepts, review key ideas, and prepare for exams by referencing the
explanations and rationales provided for each question.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
Trusted by thousands of students and professionals worldwide Page 1 of 32
, QUESTION 1
What are the 5 fundamental traits of life? With these traits in mind, are viruses alive? What evidence
supports your conclusion?
CORRECT ANSWER
-Energy Use and Metabolism
-Cell Theory
-Information, Genetics
-Replication or reproduction
-Biological Evolution
-No, viruses are not alive because they do not have cells.
RATIONALE: The answer correctly identifies the 5 fundamental traits of life, which are Energy Use and Metabolism, Cell
Theory, Information, Genetics, Replication or reproduction, and Biological Evolution, as these traits collectively define the
characteristics that distinguish living organisms from non-living entities. The answer then correctly concludes that viruses
are not alive, based on the cell theory, which is one of the fundamental traits of life, as viruses lack the defining feature of a
cell, a critical component of all living organisms.
QUESTION 2
How do hypotheses and theories differ? What do scientists mean by "theory" and does this mean the
same thing as "in theory" that non-scientists may say in conversation? Explain.
CORRECT ANSWER
A hypothesis is a constructed idea before any applicable research has been done. A theory is an idea
supported by evidence.
When scientists say theory, they mean something that is true and supported by evidence. When it is used in
everyday conversations, it is simply an idea that hasn't been proven, aka a hypothesis.
RATIONALE: This correct answer is based on the understanding of the scientific method and the nuances of language,
which highlights the distinction between the technical and colloquial meanings of "theory." By clarifying the definitions of
hypothesis and theory, the answer effectively addresses the question's request for both the scientific distinction and the
everyday usage, demonstrating a clear understanding of the context-dependent meanings.
Trusted by thousands of students and professionals worldwide Page 2 of 32
, QUESTION 3
Write the Cell Theory in your own words. Did the Cell Theory challenge or support the concept of
spontaneous generation? Explain.
CORRECT ANSWER
Cell Theory: All cells come from pre-existing cells.
The Cell Theory challenged Spontaneous Generation and tested against it through the Pasteur Flask
Experiments.
RATIONALE: The Cell Theory in its simplest form states that all living organisms are composed of one or more cells, and
these cells arise from pre-existing cells, which is a fundamental concept that contradicts the idea of spontaneous
generation. By asserting that cells only come from other cells, the Cell Theory directly challenged the concept of
spontaneous generation, a theory that proposed living organisms could spontaneously arise from non-living matter.
QUESTION 4
Outline Pasteur's swan-necked flask experiment. What was the one variable that differed between the
test and experimental groups? Why is it important to test one variable at a time?
CORRECT ANSWER
Pasteur was comparing the ideas of spontaneous generation and cell theory against each other. To do this,
he first set up an experiment where he had a straight neck flask filled with broth. He boiled all of the bacteria
out of the broth and left it to sit. After a couple of days, there were bacterial cells. He then took a straight
necked flask and bent it into a swan necked flask. He then performed the same experiment, boiling broth in
both flasks and leaving them. After a couple of weeks, the straight necked flask had bacterial cells in it again,
but the swan neck did not. Instead, the cells clumped inside the bend in the neck.
It's important to test one variable at a time so that the experiment isn't overwhelmed and you can keep track
of each variable that you're testing.
RATIONALE: Pasteur's experiment tested the idea of spontaneous generation by comparing the growth of bacteria in two
flasks with the same environment and procedure, except for the presence of a swan neck that prevented airborne
contaminants from entering the flask. The difference between the test and experimental groups was the shape of the flask
neck, which controlled for the introduction of external factors, demonstrating the importance of isolating a single variable in
an experiment.
QUESTION 5
What were the 2 claims made by Wallace and Darwin as they described the process of evolution?
CORRECT ANSWER
All species are related by common ancestry and characteristics of species can be modified from generation to
generation because of natural selection.
RATIONALE: The statement accurately represents the claims of Wallace and Darwin because it encapsulates the
fundamental principles of common descent, which implies that all species share a shared ancestry, and the mechanism of
natural selection, which drives the modification of species over generations through the process of adaptation. By
encompassing both the concept of shared ancestry and the driving force behind evolutionary change, the statement
effectively summarizes the key tenets of the evolutionary theory proposed by Wallace and Darwin.
Trusted by thousands of students and professionals worldwide Page 3 of 32
, QUESTION 6
What are the 2 conditions required for natural selection to occur? Would a trait that increases the
lifespan of each individual in the population but decreases overall fertility lead to greater or lesser fitness
of the affected individuals?
CORRECT ANSWER
Individuals must vary in characteristics that are heritable and in a certain environment, certain versions of
these traits can help individuals reproduce more than other versions.
A trait that increases lifespans but decreases overall fertility would lead to lesser fitness in the affected
individuals.
RATIONALE: For natural selection to occur, two conditions must be met: individuals must vary in heritable characteristics,
and these variations must affect their ability to reproduce in a given environment. In the scenario where a trait increases
lifespans but decreases overall fertility, it would lead to lesser fitness because, although individuals with this trait may live
longer, they would produce fewer offspring, thereby reducing their reproductive success.
QUESTION 7
What is the smallest unit that can evolve? Do individuals evolve?
CORRECT ANSWER
A population is the smallest unit that can evolve. Individuals do not evolve.
RATIONALE: Evolution is the process of change in the genetic makeup of a population over time, and this change arises
from the interactions and exchanges of genetic material between individuals within a population. Since individuals do not
reproduce on their own, the genetic changes that occur within them cannot be passed on to the next generation without
the involvement of other individuals, making the population the smallest unit that can evolve.
QUESTION 8
If you continuously bred large-pod peas to other large-pod peas, would you expect the average pod size
to get smaller or larger? Why? What is this process called?
CORRECT ANSWER
You would expect the average pod size to get larger because it is a desirable heritable trait due to natural
selection.
RATIONALE: Natural selection favors individuals with desirable traits, such as larger pod size, allowing them to reproduce
and pass those traits to their offspring. As a result, the population tends to inherit more of the desired traits, leading to an
increase in the average pod size over time through a process called artificial selection.
Trusted by thousands of students and professionals worldwide Page 4 of 32
UNIVERSITY
70+ (Fully Updated 2026) Exam Questions + Verified & Rationalized Answers
| A+ Graded
100% Guarantee Pass
📋 DOCUMENT OVERVIEW 73 Qs
This document, "Biology 211 Exam 1 - Iowa State University," covers fundamental biology concepts,
including cell theory, traits of life, biological information, genetics, and evolution. It provides a
comprehensive review of these topics through 73 questions with correct answers and detailed
explanations, along with diagrams and images. This study resource enables students to deepen their
understanding of biological concepts, review key ideas, and prepare for exams by referencing the
explanations and rationales provided for each question.
✓ Verified Answers ✓ Exam Ready ✓ Study Guide
Trusted by thousands of students and professionals worldwide
EXAM QUESTIONS
Trusted by thousands of students and professionals worldwide Page 1 of 32
, QUESTION 1
What are the 5 fundamental traits of life? With these traits in mind, are viruses alive? What evidence
supports your conclusion?
CORRECT ANSWER
-Energy Use and Metabolism
-Cell Theory
-Information, Genetics
-Replication or reproduction
-Biological Evolution
-No, viruses are not alive because they do not have cells.
RATIONALE: The answer correctly identifies the 5 fundamental traits of life, which are Energy Use and Metabolism, Cell
Theory, Information, Genetics, Replication or reproduction, and Biological Evolution, as these traits collectively define the
characteristics that distinguish living organisms from non-living entities. The answer then correctly concludes that viruses
are not alive, based on the cell theory, which is one of the fundamental traits of life, as viruses lack the defining feature of a
cell, a critical component of all living organisms.
QUESTION 2
How do hypotheses and theories differ? What do scientists mean by "theory" and does this mean the
same thing as "in theory" that non-scientists may say in conversation? Explain.
CORRECT ANSWER
A hypothesis is a constructed idea before any applicable research has been done. A theory is an idea
supported by evidence.
When scientists say theory, they mean something that is true and supported by evidence. When it is used in
everyday conversations, it is simply an idea that hasn't been proven, aka a hypothesis.
RATIONALE: This correct answer is based on the understanding of the scientific method and the nuances of language,
which highlights the distinction between the technical and colloquial meanings of "theory." By clarifying the definitions of
hypothesis and theory, the answer effectively addresses the question's request for both the scientific distinction and the
everyday usage, demonstrating a clear understanding of the context-dependent meanings.
Trusted by thousands of students and professionals worldwide Page 2 of 32
, QUESTION 3
Write the Cell Theory in your own words. Did the Cell Theory challenge or support the concept of
spontaneous generation? Explain.
CORRECT ANSWER
Cell Theory: All cells come from pre-existing cells.
The Cell Theory challenged Spontaneous Generation and tested against it through the Pasteur Flask
Experiments.
RATIONALE: The Cell Theory in its simplest form states that all living organisms are composed of one or more cells, and
these cells arise from pre-existing cells, which is a fundamental concept that contradicts the idea of spontaneous
generation. By asserting that cells only come from other cells, the Cell Theory directly challenged the concept of
spontaneous generation, a theory that proposed living organisms could spontaneously arise from non-living matter.
QUESTION 4
Outline Pasteur's swan-necked flask experiment. What was the one variable that differed between the
test and experimental groups? Why is it important to test one variable at a time?
CORRECT ANSWER
Pasteur was comparing the ideas of spontaneous generation and cell theory against each other. To do this,
he first set up an experiment where he had a straight neck flask filled with broth. He boiled all of the bacteria
out of the broth and left it to sit. After a couple of days, there were bacterial cells. He then took a straight
necked flask and bent it into a swan necked flask. He then performed the same experiment, boiling broth in
both flasks and leaving them. After a couple of weeks, the straight necked flask had bacterial cells in it again,
but the swan neck did not. Instead, the cells clumped inside the bend in the neck.
It's important to test one variable at a time so that the experiment isn't overwhelmed and you can keep track
of each variable that you're testing.
RATIONALE: Pasteur's experiment tested the idea of spontaneous generation by comparing the growth of bacteria in two
flasks with the same environment and procedure, except for the presence of a swan neck that prevented airborne
contaminants from entering the flask. The difference between the test and experimental groups was the shape of the flask
neck, which controlled for the introduction of external factors, demonstrating the importance of isolating a single variable in
an experiment.
QUESTION 5
What were the 2 claims made by Wallace and Darwin as they described the process of evolution?
CORRECT ANSWER
All species are related by common ancestry and characteristics of species can be modified from generation to
generation because of natural selection.
RATIONALE: The statement accurately represents the claims of Wallace and Darwin because it encapsulates the
fundamental principles of common descent, which implies that all species share a shared ancestry, and the mechanism of
natural selection, which drives the modification of species over generations through the process of adaptation. By
encompassing both the concept of shared ancestry and the driving force behind evolutionary change, the statement
effectively summarizes the key tenets of the evolutionary theory proposed by Wallace and Darwin.
Trusted by thousands of students and professionals worldwide Page 3 of 32
, QUESTION 6
What are the 2 conditions required for natural selection to occur? Would a trait that increases the
lifespan of each individual in the population but decreases overall fertility lead to greater or lesser fitness
of the affected individuals?
CORRECT ANSWER
Individuals must vary in characteristics that are heritable and in a certain environment, certain versions of
these traits can help individuals reproduce more than other versions.
A trait that increases lifespans but decreases overall fertility would lead to lesser fitness in the affected
individuals.
RATIONALE: For natural selection to occur, two conditions must be met: individuals must vary in heritable characteristics,
and these variations must affect their ability to reproduce in a given environment. In the scenario where a trait increases
lifespans but decreases overall fertility, it would lead to lesser fitness because, although individuals with this trait may live
longer, they would produce fewer offspring, thereby reducing their reproductive success.
QUESTION 7
What is the smallest unit that can evolve? Do individuals evolve?
CORRECT ANSWER
A population is the smallest unit that can evolve. Individuals do not evolve.
RATIONALE: Evolution is the process of change in the genetic makeup of a population over time, and this change arises
from the interactions and exchanges of genetic material between individuals within a population. Since individuals do not
reproduce on their own, the genetic changes that occur within them cannot be passed on to the next generation without
the involvement of other individuals, making the population the smallest unit that can evolve.
QUESTION 8
If you continuously bred large-pod peas to other large-pod peas, would you expect the average pod size
to get smaller or larger? Why? What is this process called?
CORRECT ANSWER
You would expect the average pod size to get larger because it is a desirable heritable trait due to natural
selection.
RATIONALE: Natural selection favors individuals with desirable traits, such as larger pod size, allowing them to reproduce
and pass those traits to their offspring. As a result, the population tends to inherit more of the desired traits, leading to an
increase in the average pod size over time through a process called artificial selection.
Trusted by thousands of students and professionals worldwide Page 4 of 32
