Jennifer wants to use the brand of fertilizer that gives her the most tomatoes from each plant. She breaks her plants into groups and uses a different brand of fertilizer on each group. The experimental/independent variable is represented by

amount of fruit produced by the tomato plants

Jennifer wants to use the brand of fertilizer that gives her the most tomatoes from each plant. She breaks her plants into groups and uses a different brand of fertilizer on each group. The response/dependent variable is represented by

amount of fruit produced by the tomato plants.

Jeff wants to know what concentration of bleach would be most effective at killing bacteria without overdoing it and using too much bleach. Jeff makes 3 solutions of bleach in water, 1, 5, and 10% solutions. He then adds a specific number of bacteria to a test tube of each solution and waits 3 minutes. He puts these bacterial on a petri plate and later counts colonies to see how many bacteria survived. In this experiment, the number of bacteria that were killed would be

experimental/independent variable.

Jeff wants to know what concentration of bleach would be most effective at killing bacteria without overdoing it and using too much bleach. Jeff makes 3 solutions of bleach in water, 1, 5, and 10% solutions. He then adds a specific number of bacteria to a test tube of each solution and waits 3 minutes. He puts these bacterial on a petri plate and later counts colonies to see how many bacteria survived. In this experiment, the concentration of the bleach would be

experimental/independent variable.

Which statement regarding the scientific method is false?

A control group is always exposed to the factor being tested.

A theory is an explanation of why a pattern occurs.

Confounding variables make experiments difficult to interpret.

Deductive reasoning is often used in the design of an experiment.

In the antibiotic experiment in the textbook, what is the independent/experimental variable?

Whether or not the patient gets one of the antibiotics or placebo.

Presence/absence of stomach ulcers.

Number of people in the control group.

Number of people in the taking antibiotic A.

Which of the following is a way to control for confounding variables in the antibiotic experiment covered in the textbook?

allowing the person doing the endoscopies to know which subjects are controls

randomly assigning test subjects ot different groups

Which of the following is a way to control for confounding variables in the antibiotic experiment covered in the textbook?

using a double blind study design

randomly assigning test subjects to different groups.

Which of the following statements about the strengths of science is false?

Scientific theories, once found to be true, are always true.

Science is publicly understandable.

Scientific theories can change as new data become available.

Science is capable of making measurable predictions.

Emerging diseases enter the human population due to

new interactions with other organisms that can then act as vectors of disease.

changes in technology use that can expose humans to new infectious organisms

from the destruction of coral reefs.

In a study of prairie restoration, researchers planted 20 plots of 8 species of native plants in two ways, 10 plots interspersed and 10 plots aggregated. Interspersed plots had species mixed together, while the aggregated plots had each species grouped with its own kind, Figure 1. The researchers looked at the effect of time and, later, of fire on the number of species in the plots, Figure 2. To look at the effect of fire, they burned half of the plots October of the fifth year.

Whether or not the plants were aggregated or interspersed.

The atomic mass of an element

is determined by the number of protons and neutrons it contains.

equals the number of protons plus the number of electrons.

depends on the number of electrons in the outermost shell.

If an element has an atomic number of 12, then

the atomic mass must also be 12.

the atom must have only one orbital.

Isotopes of a given element have

the same number of protons but differ in atomic mass.

the same atomic mass but a different number of protons.

a different number of electrons.

a sharing of electrons between two atoms.

a type of bond that results in ionic compounds.

the transfer of electrons from one atom to another.

an attraction of charged atoms.

When an ionic bond forms, electrons are

transferred from one atom to another.

Which statement regarding acids and bases is correct?

Acids increase the proportion of hydrogen ions (H+), and bases reduce the proportion of H+

Acids increase the pH, and bases decrease the pH.

Acids are harmful, but bases are not harmful.

Acids combine with bases to form sugars.

Since pure water is neutral in pH, it contains

an equal number of hydrogen ions (H+) and hydroxide ions (OH-)

neither hydrogen ions (H+) nor hydroxide ions (OH-)

the lower the hydrogen ion (H+) concentration.

the greater the hydroxide ion (OH-) concentration.

the closer the hydroxide ion (OH-) concentration comes to equaling the hydrogen ion (H+) concentration.

Water is a liquid at room temperature. This is due to

hydrogen bonding between water molecules.

ionic bonding of the atoms in the water molecule.

covalent bonding in the water molecule.

covalent bonding between water molecules.

hydrogen bonding within the water molecule.

always contain carbon and hydrogen.

are found only in organisms, hence their name.

polysaccharide used to store glucose/energy.

monosaccharide used for quick energy.

protein found in cell membranes.

nucleic acid found in the nucleus of a cell.

A genetic mutation can cause a change in the sequence of the 20 amino acids used to build proteins. Such a change is a change to the protein's

primary structure, but this will likely alter higher levels of structure as well.

What type of reaction is necessary to produce a dipeptide from individual amino acids?

dipeptides are not formed from amino acids

none of the answer choice will form a dipeptide

POB Exam 1

Authored by Lily Adams

Science

University

NGSS covered

Used 3+ times

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127 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which level of biological organization is composed of several tissues?

organism

organ system

organ

cell

molecules

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A physician specializes in surgery involving the following group of organs: mouth,
esophagus, stomach, and intestines. Overall, what is the highest level of organization
that this physician is specialized in?

cell

tissue

organ

organ system

organism

Tags

NGSS.MS-LS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which sequence correctly lists the different levels of biological organization, from the
smallest and simplest to the largest and most complex?

cells-organs-tissues-organ systems-organism

cells-tissues-organ systems-organs-organism

tissues-cells-organs-organ systems-organism

tissues-organs-organ systems-organism-cells

cells-tissues-organs-organ systems-organism

Tags

NGSS.MS-LS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement about living organisms is not correct?

Living organisms create energy.

Living organisms maintain homeostasis.

Living organisms reproduce.

Living organisms have adaptations.

Living organisms grow and develop.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Organs are composed of tissues, which are composed of cells. This is an example of
which characteristic of life?

Living things grow and develop.

Living things respond to stimuli.

Living things maintain themselves by homeostasis.

Living things have levels of hierarchical organization.

Living things are adapted to the environment.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All the birds called cardinals (Cardinals cardinalis) in a forest would comprise a(n)

population

ecosystem

community

biosphere

species

Tags

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All the banded sunfish (Enneacanthus obesus) in a pond would comprise a(n)

population

ecosystem

community

biosphere

species

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POB Exam 1

Which level of biological organization is composed of several tissues?

A physician specializes in surgery involving the following group of organs: mouth,esophagus, stomach, and intestines. Overall, what is the highest level of organizationthat this physician is specialized in?

Which sequence correctly lists the different levels of biological organization, from thesmallest and simplest to the largest and most complex?

Which statement about living organisms is not correct?

Organs are composed of tissues, which are composed of cells. This is an example ofwhich characteristic of life?

All the birds called cardinals (Cardinals cardinalis) in a forest would comprise a(n)

All the banded sunfish (Enneacanthus obesus) in a pond would comprise a(n)

Jennifer wants to use the brand of fertilizer that gives her the most tomatoes fromeach plant. She breaks her plants into groups and uses a different brand of fertilizer oneach group. The experimental/independent variable is represented by

Jennifer wants to use the brand of fertilizer that gives her the most tomatoes fromeach plant. She breaks her plants into groups and uses a different brand of fertilizer oneach group. The response/dependent variable is represented by

Access all questions and much more by creating a free account

Popular Resources on Wayground

Discover more resources for Science

A physician specializes in surgery involving the following group of organs: mouth,
esophagus, stomach, and intestines. Overall, what is the highest level of organization
that this physician is specialized in?

Which sequence correctly lists the different levels of biological organization, from the
smallest and simplest to the largest and most complex?

Organs are composed of tissues, which are composed of cells. This is an example of
which characteristic of life?

Jennifer wants to use the brand of fertilizer that gives her the most tomatoes from
each plant. She breaks her plants into groups and uses a different brand of fertilizer on
each group. The experimental/independent variable is represented by

Jennifer wants to use the brand of fertilizer that gives her the most tomatoes from
each plant. She breaks her plants into groups and uses a different brand of fertilizer on
each group. The response/dependent variable is represented by