Find study materials for any course. Check these out:
Browse by school
Make your own
To login with Google, please enable popups
To login with Google, please enable popups
Don’t have an account?
To signup with Google, please enable popups
To signup with Google, please enable popups
Sign up withor
You have isolated a liquid from a sample of beans. You add the liquid to a beaker of water and shake vigorously. After a few minutes, the water and the other liquid separates into two layers. To which class of biological macromolecules does the unknown liquid most likely belong?
Mutation is essential to:
- An organism's survival
- Sexual reproduction
How is a denatured protein different from a normal protein?
- A denatured protein does contain amino acids.
- A denatured protein has no secondary or tertiary structure.
- A denatured protein is composed of nucleotides
- A denatured protein contains many disulfide bridges.
Carbon has an atomic number of six. Carbon would most likely:
- Share electrons
- Gain electrons
- Lose electrons
- Share protons
The scientific method includes all of the following EXCEPT:
- A testable theory
- An observation
- A hypothesis
Phosphorus has an atomic number of fifteen, so what will be the distribution of its electrons?
- The first energy level will have eight and the second will have seven.
- The first energy level will have two, the second will have eight, and the third will have five.
- The first energy level will have two and the second will have thirteen.
- The first, second, and third energy levels will each have five electrons.
Which of the following sequences of organization is likely to be seen in a multicellular organism, going from smallest to largest?
- Cell, organ, tissue, organism
- Cell, organ, organ system, tissue
- Cell, tissue, organ system, organism
- Tissue, system, cell, organ
Which of the following provides long-term energy storage for plants?
If a substance measures 7 on the pH scale, that substance:
- May be lemon juice
- Has equal concentration of H+ and OH- ions. - Has greater concentration of OH- than H+ ions
- Is basic.
In a word, evolution means _____.
The main difference between an autotroph and a heterotroph is:
- How they reproduce.
- How they respond to stimuli.
- The placement of their organelles.
- How they obtain energy.
What is the name of all the chemical energy transformations that occur within a cell?
DNA polymers are composed of Amino acid monomers.
Which of the following correctly matches an organic polymer with its respective monomer?
- Protein and amino acids
- Carbohydrates and polysaccharides
- DNA and ATP
- Lipids and steroids
Which four elements make up approximately 98% of living matter?
- Carbon, hydrogen, nitrogen, oxygen
- Carbon, sulfur, phosphorus, hydrogen
- Carbon, sodium, chlorine, magnesium
- Carbon, oxygen, sulfur, calcium
The three domains of life include Bacteria, Archaea, and:
Sweating is a useful cooling device for humans because:
- Water takes up a great deal of heat in changing from its liquid state to its gaseous state.
- Water takes up a great deal of heat in changing from its solid state to its liquid state. - Water is an outstanding solvent.
- Water can exist in three states at temperatures common on Earth.
Which of these molecules stores genetic information in all cells?
The complete elimination of a species of life is called:
You observe a plant on your windowsill that is growing at an angle toward the outside. This is an example of a living thing:
- Maintaining homeostasis
- Responding to stimuli
Which pair of organelles is responsible for energy supply to eukaryotic plant cells?
A. ribosomes and mitochondria
B. chloroplasts and mitochondria
C. Golgi bodies and ribosomes
D. mitochondria and lysosomes
When a muscle cell demands energy to perform its work of contraction, what happens to ATP
A. ATP manufactures more ATP.
B. ATP enters a metabolic pathway.
C. ATP is broken down.
D. ATP is phosphorylated.
ATP is broken down.
A freshwater protozoan, such as Paramecium, tends to _____ because it lives in a ______ environment.
A. gain water; hypotonic
B. lose water; hypertonic
C. gain water; hypertonic
D. lose water; hypotonic
DNA is located in which of the following?
A. prokaryotic cells
B. plant cells
C. animal cells
D. all of the above
The slowest rate of diffusion of dye particles in water will occur in which situation?
A. dye particles in water at 40 degree C
B. dye particles in water at 30 degree C
C. dye particles in water at 20 degree C
D. dye particles in water at 10 degree C
A major difference between Animal and Plant cells is
A. Animal cells have plasma membranes and plant cells don’t
B. Animal cells have cell walls and plant cells don’t
C. Plant cells have plasma membranes and animal cells don’t
D. Plant cells have cell walls and animal cells don’t
The BEST description of a coupled reaction is
A. a reaction that occurs right after another reaction.
B. two reactions that involve one providing energy for the other.
C. reactions that occur during sexual reproduction.
D. two reactions that occur in the same organelle.
Energy that is not converted to useful energy is usually given off as
Which of the following is part of the first law of thermodynamics?
A. Energy cannot be created or destroyed.
B. Kinetic energy is stored energy.
C. Energy cannot be transferred or transformed.
D. Exergonic reactions are coupled with endergonic reactions.
Ribosomes are the site of synthesis of
Entropy is a measure of
A. increase in orderliness.
B. increase in potential energy.
C. increase in randomness.
D. increase in kinetic energy.
The nucleus of cells is where the
A. DNA is located
B. mitochondria are located
C. chloroplasts are located
D. party is located
The cells that line the intestine have highly folded plasma membranes on the absorptive surface of the intestine because
A. this will increase volume, making the cells more efficient.
B. this will increase surface area to volume ratio.
C. these cells are most likely active in secretion.
D. large amounts of plasma membrane will be needed for endocytosis.
The current theory of the structure of the plasma membrane is best described by the ___ model.
C. unit membrane
Which of the following has the greatest amount of kinetic energy?
A. tank of gasoline
B. moving car
C. hot car engine
D. cool air surrounding the engine
A biologist ground up some plant cells and then centrifuged the mixture. She obtained some organelles from the pellet in the test tube that took up CO2 and gave off O2. The organelles are most likely
Beaker A has a 10% sucrose solution, and beaker B has an 8% sucrose solution. Choose the correct statement.
A. Beaker A is isotonic to Beaker B.
B. Beaker B is hypertonic to Beaker B.
C. Beaker B is hypotonic to Beaker A.
If red blood cells are taken from the body and placed in a hypertonic solution, what happens to the cells?
A. The cells swell and burst because water moves into the cells.
B. The cells shrivel up because water leaves the cells.
C. The cells remain unchanged due to equal solute concentration inside and outside the cells.
D. The cells remain unchanged due to equal water concentrations inside and outside the cells.
All of the following are important functions of the cytoskeleton EXCEPT
A. storage of food molecules.
B. support of organelles.
C. maintenance of shape.
D. movement of organelles.
All of the following statements pertaining to catalysts are true EXCEPT
A. biological catalysts are specific enzymes.
B. catalysts increase activation energy requirements.
C. catalysts increase reaction rate.
D. catalysts are not permanently altered during reaction.
Which of the following is capable of converting light energy to chemical energy?
Prokaryotic as well as eukaryotic cells possess
D. a nucleus.
How is your body able to counteract the effects of entropy?
A. regular exercise.
C. bathing regularly.
D. eating a balanced diet.
If two organisms are of similar shape but one is larger than the other which organism would have the greater surface area : volume ratio? A. large organism
B. small organism
C. it would be equal
All cells possess all of the following components EXCEPT
B. genetic material.
C. nuclear membrane.
D. plasma cell membrane.
A cell adapted for waste storage and disposal would probably contain a large number of
Which of the following is/are evidence that mitochondria and chloroplasts were once free-living organisms?
A. They produce ATP.
B. They contain their own DNA.
C. Both capture energy of sunlight to make ATP.
D. A and B
In exergonic chemical reactions
A. reactants have more energy than products. B. energy is stored by the reactions.
C. reactants have less energy then products.
D. reactants and products possess equal amounts of energy.
Scientific inquiry is based on
A. Natural Causes
B. information found in a gossip magazine
C. stories that are passed down through generations.
D. Cultural biases or traditions
Which of the following is an example of a natural cause?
A. Maggots appear spontaneously on rotting meat
B. if you sneeze, you will die
C. Epilepsy is a disease caused by uncontrolled firing of nerve cells in the brain. D. Mice arise from discarded garbage
Science cannot answer certain faith-based questions because
A. there aren’t enough variables
B. faith-based beliefs are impossible to either prove or disprove
C. scientists are not able to study human behavior
D. faith requires deductive reasoning
Which of the following is FALSE about scientific theories?
A. They can be either supported or modified by new observations
B. They are used to support observations using deductive reasoning.
C. They have been thoroughly tested
D. They are firmly established and cannot be refuted
E. They are developed by inductive reasoning
Which of these would be an example of a NON-scientific study?
A. A company uses different advertising methods for a product to determine which one produces the most sales.
B. NASA sends tadpoles up in the space shuttle to see how gravity affects their development.
C. People are immunized with different vaccines to determine their relative effectiveness against the flu virus.
D. Consumers are asked which tomato variety produces the best-tasting spaghetti sauce.
E. A study determines the differences in the species composition in two parks.
We use the scientific method every day. Imagine that your car doesn’t start one morning before school. Which of these is a reasonable hypothesis regarding the problem?
A. I should change the battery or the starter.
B. If I put gas in my car, it will start.
C. I should check whether the lights were left on and drained my battery.
D. I’m going to be late.
E. I should add a quart of oil.
A scientific theory
A. Is less reliable than a hypothesis.
B. is a general explanation for a natural phenomena.
C. will never be changed.
D. is an educated guess.
A scientific explanation that is conditional and requires more investigation is called a
A carefully formulated scientific explanation that is based on extensive observations and is in accord with scientific principles is called a
All of the following are features of the scientific method EXCEPT
A. repeatable by other scientists.
B. hypothesis formulation.
C. supernatural causes.
D. observation and experimentation.
E. deductive reasoning.
Suppose you are testing a treatment for AIDS patients and find that 75% respond well, whereas 25% show no improvement or a decline in health. You should
A. conclude that you have proven the effectiveness of the drug.
B. review the results, modify the drug or the dosage, and repeat the experiment.
C. begin work on developing a new drug.
D. discontinue experimentation with this treatment because 25% of patients did not improve.
E. conclude that only 75% of AIDS patients should be treated.
Alexander Fleming observed a colony of mold that inhibited the growth of nearby bacteria. What was the hypothesis proposed by Fleming to explain this result?
A. The mold was dead.
B. The mold used all of the nutrients so that the bacteria couldn’t grow.
C. The mold produced a substance that killed nearby bacteria.
D. The bacteria changed their DNA when growing near the mold.
Imagine that 1 milliliter of an experimental drug diluted in a saline solution is injected into 20 pregnant mice to determine possible side effects. Which of the following is a suitable control for this experiment?
A. 20 pregnant mice injected with 2 milliliters of the drug.
B. 20 non-pregnant mice injected with 1 milliliter of the drug.
C. 20 male mice injected with 1 milliliter of saline.
D. 20 male mice injected with 1 milliliter of the drug.
E. 20 pregnant mice injected with 1 milliliter of saline.
Which of the following statements is a hypothesis rather than a theory?
A. Female birds prefer to mate with male birds that have longer tails.
B. Matter is composed of atoms.
C. Living things are made of cells.
D. Modern organisms descended from preexisting life-forms.
16. Which of the following is TRUE regarding faith-based beliefs and scientific theories?
A. Faith-based beliefs can become scientific theories.
B. Scientific theories are not modifiable, but faith-based beliefs are.
C. Both faith-based beliefs and scientific theories can be proven.
D. Any and all faith-based beliefs can be disproved, but scientific theories cannot.
E. Any and all scientific theories can be disproven, but faith-based beliefs cannot.
What is the correct sequence of increasing organization?
A. Molecule, cell, organelle, organ
B. Organelle, tissue, cell, organ
C. Organ, tissue, cell, molecule
D. Cell, tissue, organ, organ system
E. Atom, molecule, tissue, cell
Which of the following levels of organization is the most inclusive (I.e., includes the most life-forms)?
The smallest units that still retain the characteristics of an element are called
E. organic molecules.
Which of the following is an example of deductive reasoning?
A. Living objects are composed of cells.
B. If an object exhibits all the characteristics of life, it must be living.
C. Atoms make up molecules, which make up cells, which make up tissues.
D. All objects on Earth will fall down when dropped, and none will “Fall up.”
The experiments of Francesco Redi
A. disproved the scientific method.
B. used the scientific method to prove the idea of spontaneous generation.
C. disproved the idea of spontaneous generation.
D. disproved that maggots and flies were related.
E. determined that fly larvae were present in raw meat, and when left on the counter they turned into flies.
Francesco Redi designed an experiment to test the notion of spontaneous generation. He left the first jar of meat open to the air and covered the second jar. The first jar would be called the _____ jar.
To test the effect of vitamin D on growth, two groups of rats were raised under identical conditions and fed the same diet. One of the groups received daily injections of vitamin D. The other group received injections of saline, which did not contain vitamin D. All the rats were weighed weekly for 2 months. In this experiment, the control was the
A. average weight gain of the rats.
B. group receiving saline.
C. 2-month period of time.
D. group receiving vitamin D.
Evolution is sometimes described as the change from preexisting life-forms to modern-day organisms. What actually changes, in every case of evolution, is the
A. genetic makeup of the species, due to mutations.
B. ability of organisms to respond to external stimuli.
C. energy and nutritional demands of the organisms.
D. species’ physical appearance. E. rate of reproduction.
All of the following are important to the theory of evolution EXCEPT
B. variation in traits within an entire population.
C. inheritance of traits.
D. changes in individuals within their lifetime. E. environmental change.
Which is NOT an example of evolution?
A. annual changes in the flu virus due to mutations.
B. The 2- to 3- year effectiveness of the most commercial pesticides in killing insects.
C. A dog learning how to open the cabinet where its food is kept.
D. Flightless birds living on islands without predators
E. The development of antibiotic-resistant bacteria
A mutation can be the cause for
A. sexual reproduction.
B. sperm and egg formation.
C. natural selection.
D. growth and development.
E. environmental change.
A mutation is a
A. dose of radiation.
B. change in the DNA sequence.
C. physical deformity, such as the loss of a limb.
D. defective egg or sperm cell.
The concept of evolution is based on
A. any type of genetic variation within a population.
B. survival and successful reproduction in organisms with favorable variations.
C. all genetic variation in a population being equally successful in the same environment. D. parents with variations that pass these variations on to their offspring.
All of the following are examples of adaptations EXCEPT
A. larger teeth in beavers for gnawing wood.
B. different beak shapes for birds that eat seeds or insects.
C. flower coloration that attracts pollinators.
D. insects that resemble twigs.
E. mice learning a maze to get food.
Suppose an organism has an enzyme that repairs changes in its DNA. The result is a decrease in mutations. This trait would definitely influence the organism’s ability to
B. obtain energy.
D. maintain homeostasis.
The variation among individuals, on which natural selection acts, describes
A. random occurrences in the lifetimes of individuals.
B. genetic differences.
C. nutritional differences.
D. physical training and exercise.
Chromosomes are made of
D. DNA and proteins.
A change in the genetic makeup of a species over time is called
A. natural causality.
Adaptations include all of the following EXCEPT
A. larger body size in male gorillas, which fight over females.
B. reduced heart rate and oxygen consumption in seals that dive deep for long periods of time.
C. inborn migratory behavior of young birds born in the Artic.
D. teaching a pet parrot to talk.
Dinosaurs are not alive today because they
A. evolved adaptations that were beneficial in their constant, unchanging environment.
B. did not evolve fast enough to keep up with rapid environmental change.
C. evolved too quickly in response to a changing environment.
D. did not possess the genetic material that beneficial mutations act on.
Which of the following is a characteristic of living organisms?
A. Have membrane-bound organelles
B. Maintenance and regulation of internal conditions
C. Ability to produce energy
D. Eat other organisms
E. Have a nucleus
All of the following are true of all living organisms EXCEPT that they
A. are made of cells.
B. can reproduce themselves.
C. can grow.
D. Possess either DNA or RNA.
E. respond to stimuli.
After you drink a glass of acidic lemonade, your body’s pH does not change. This is an example of how humans and other organisms
A. are immune to weak acids.
B. maintain cellular organization.
C. maintain precise internal conditions through homeostasis.
D. evolve in response to the environment.
Why do humans born without sweat glands usually not survive?
A. Sweat glands create openings in the skin where gas exchange occurs.
B. Sweating is important for eliminating impurities from the body.
C. Sweating is the only way the body eliminates excess water.
D. Sweating is an important mechanism for maintaining the correct body temperature.
An organism’s ability to detect stimuli from either the internal or external environment is called
A. natural selection.
Using its antennae, the male moth finds female moths by following a trail of airborne chemicals, called pheromones, upwind from the female producing them. This is an example of how living things
A. detect and respond to stimuli.
C. maintain precise internal conditions.
D. acquire nutrients.
An organism in the domain Eukarya is characterized by all of the following EXCEPT
A. the ability to maintain precise internal conditions.
B. being composed of prokaryotic cells.
C. the potential to grow and reproduce.
D. ingestion of organic matter to acquire nutrients.
Why do heterotrophs require “food” for survival?
A. Food provides the organic chemicals needed by heterotrophs.
B. Food provides at least half of the water required by heterotrophs.
C. Food is an alternative source of energy for heterotrophs when sunlight is unavailable.
D. Heterotrophs cannot photosynthesize without the chemicals provided by food.
Of the following levels of organization, Archaea have
A. atoms, molecules, and organs.
B. molecules only.
C. atoms only.
D. atoms and molecules.
E. organs only.
In evolutionary terms, which of the following cells is considered to be the most primitive?
In which kingdom does a multicellular, eukaryotic, photosynthetic organism belong?
A basic difference between a prokaryotic cell and a eukaryotic cell is that the prokaryotic cell
A. lacks a nucleus.
B. is considerably larger.
C. possess membrane-bound organelles.
D. lacks DNA.
E. is structurally more complex.
Which of the following statements about the Bacteria and Eukarya domains is TRUE?
A. Only members of Eukarya have the ability to grow and reproduce.
B. All members of Bacteria are single-celled and all members of Eukarya are multicellular. C. All members of Bacteria are prokaryotic cells and all members of Eukarya are eukaryotic cells.
D. All members of Bacteria acquire nutrients via ingestion and all members of Eukarya acquire nutrients by photosynthesis.
Which group has prokaryotic individuals?
A. Kingdom Plantae
B. Kingdom Fungi
C. Domain Archaea
D. Protists kingdoms
E. Kingdom Animalia
Which kingdom possess unicellular animal-like species and unicellular plantlike species?
A cell that lacks organelles is a(n)
A. animal cell.
B. member of the Kingdom Plantae.
C. eukaryotic cell.
D. prokaryotic cell.
Sign up for free and study better.
Get started today!