Life Science Test #1 Name:_______________
Please show work or list sources as needed
1. An independent individual that possesses the characteristics of life is called a(n)
2. An organ is made up of several
a. biological molecules.
b. organ systems.
3. The simplest entity that exhibits all of the properties of life is called a(n)
4. The scientific name for the black-footed ferret is Mustela nigripes. The name Mustela indicates the
____________ to which this organism belongs.
5. Characteristics usually associated with life include all of the following except
b. responsiveness to stimuli.
d. lack of change from generation to generation.
e. a high degree of organization.
6. To maintain order within their cells and organs, all living things must
a. extract energy from sunlight.
b. constantly change.
c. carry on metabolism.
e. be able to move.
7. Organisms that undergo asexual reproduction
a. produce offspring that are identical to each other and to the parent.
b. are usually very complex.
c. do not require energy to reproduce.
d. produce offspring that are different from each other.
e. require another organism to reproduce.
8. All the living organisms in a particular area at a particular time make up a
9. The first step in the scientific method is to
a. identify a problem.
b. propose a solution.
c. predict the results of an experiment.
d. perform an experiment.
e. draw a conclusion.
10. Which of the following is considered to be the most basic living unit?
c. organ system
11. What is the term that describes the study of the relationship between living things and components
of their environment?
12. Which of the following concepts best describes the wide variety of dog species we observe, ranging
from the domesticated golden retriever or the basset hound, to the wild dogs of Africa, to foxes?
c. special creation
e. inheritance of acquired characteristics
13. The units of inheritance are
d. metabolic activities.
14. Organisms that have descended from the same initial group and have the ability to interbreed belong
to the same
15. In populations, adaptation usually arises through
a. natural selection.
16. The “bead” that allows the HIV particle to attach to and enter cells is
a. made of protein.
b. hidden within the virus particle.
c. part of the matrix of the virus.
d. made of RNA.
e. designed to protect the virus’s RNA..
17. In an atom, the electrons are
a. housed within the nucleus.
b. moving through the nucleus.
c. present in various energy shells.
d. usually at rest, but occasionally move.
e. positively charged.
18. Rank the following chemical bonds from weakest to strongest:
a. hydrogen, ionic, covalent
b. hydrogen, covalent, ionic
c. ionic, hydrogen, covalent
d. ionic, covalent, hydrogen
e. covalent, ionic, hydrogen
19. Surface tension of water is due to
a. ionic bonding.
b. ionization of water.
c. the ability of water to act as a solvent.
d. hydrogen bonding.
e. water molecules repelling each other.
20. The internal pH of most cells is near neutral. This allows
a. water to break down into H+ and OH-.
b. enzymes within the cells to act at peak efficiency.
c. the buffers produced within the body to affect these cells.
d. enzymes outside of these cells to function.
21. Classes of lipids include all of the following except
22. What method is often used by cells to move large solid material into the cell?
a. facilitated diffusion
c. simple diffusion
d. active transport
23. As one form of energy is converted into another, there is always some energy lost as
a. chemical energy.
b. activation energy.
d. kinetic energy.
24. Substances that start chemical reactions are called
25. The most common energy-carrying molecule in the cell is
26. All enzymes act by
a. breaking hydrogen bonds between molecules.
b. lowering the activation energy of specific chemical reactions.
c. breaking and forming ionic bonds between ions.
d. allowing products to be changed during the chemical reactions.
e. raising the activation energy of specific chemical reactions.
27. What process occurs in both the aerobic and anaerobic pathways?
b. Krebs cycle
c. electron transport chain
e. anaerobic processes
28. The role of oxygen in cellular respiration is to
a. combine with carbon atoms to form carbon dioxide.
b. allow glycolysis to continue.
c. act as the final electron acceptor.
d. aid in the transport of pyruvate into the mitochondria.
e. supply an energy molecule.
29. The main purpose of fermentation reactions is to
a. produce ATP.
b. regenerate the electron carriers needed for glycolysis.
c. produce the building blocks for biological molecules.
d. prepare the pyruvate for the Krebs cycle.
e. provide various products useful for man.
30. In photosynthesis, the light-dependent reactions
a. can take place day or night.
b. produce ADP and carbon dioxide.
c. are uncoupled from the light-independent reactions.
d. lead to carbon fixation.
e. produce ATP and energy stored in electron carriers
31. Almost all enzymes are
d. nucleic acids.
e. amino acids.
32. A substrate
a. fits into the active site of a specific enzyme.
b. fits into the active site of another specific substrate.
c. catalyzes a chemical reaction.
d. is always a protein.
e. lowers the energy of activation in a chemical reaction.
33. Cytokinesis in plant cells differs from cytokinesis in animal cells because
a. the contractile protein, actin, is important only in plant cells.
b. a contractile ring forms only in plant cells.
c. in plant cells, the cell plate must also divide into two parts.
d. plant cells have a rigid cell wall.
e. there is no difference.
34. Pairs of chromosomes that are similar in size and genetic composition are
e. homologous chromosomes.
35. In humans, a gene that has been identified as causing a type of skin cancer is the
a. mutant superman.
b. sonic hedgehog.
c. superhero aardvark.
d. superwoman echidna.
e. mutant mole rat.
36. At the end of metaphase I, separate.
a. homologous chromosomes
b. haploid chromatids
c. sister chromatids
e. germ cells
37. Gregor Mendel was successful in his analysis of the genetics of pea plants because
a. he examined and analyzed both the F1 and F2 generations.
b. he studied the parental plants to determine their differences.
c. pea plants have genetics different from other organisms.
d. he decided to only look at his results in an objective manner.
e. he studied a trait that had a strange inheritance pattern.
38. An allele is
a. the dominant form of a gene.
b. an alternate form of a gene.
c. always recessive.
d. the main factor determining a trait.
e. always one of a pair.
39. The genetic makeup of a particular trait in an individual is its
40. Special cells found in the gonads that give rise to gametes upon division are called
a. germ cells.
b. somatic cells.
c. stem cells.
d. basal cells.
e. Egg cells
41. Sickle cell anemia is an example of what type of inheritance?
a. incomplete dominance
b. complete dominance
d. recessive dominance
e. multiple alleles
42. With respect to genetic traits, what is the opposite of recessive?
43. Different forms of a gene are known as
44. The physical characteristics of an organism resulting from its genes are known as the organism’s
c. recessive characteristics.
45. An organism with two copies of the same allele is said to be
e. a hybrid.
46. Mendel correctly surmised that the 3 dominant:1 recessive phenotypic ratio seen in the F2 generation
pea plants was due to
a. a tendency to have more fertilization events yielding homozygous dominant than homozygous
c. genotypic selection.
d. random combination of sperm and egg with respect to the allele carried.
certain phenotypes having a selective advantage
47. A gene on the X chromosome is said to be
b. sex limited.
e. a mutation.
48. Usually, an egg cell from a human female contains
a. one X chromosome and one Y chromosome.
b. one X chromosome.
c. one Y chromosome.
d. two X chromosomes.
e. two Y chromosomes.
49. Kool-Aid readily dissolves in water. This means that Kool-Aid is
a. an acid.
d. a base.
e. a buffer.
50. Viruses are not considered to be living things, although they can evolve, and they do have genetic
material. However, they
a. cannot reproduce on their own.
b. cannot cause disease.
c. possess a molecular structure entirely different from living cells.
d. do not possess DNA.
e. do not possess enzymes.
51. Water is often known as a universal solvent, it dissolves polar molecules as well as
a. ionic compounds.
b. nonionic compounds.
c. hydrophobic compounds.
d. covalently bonded compounds.
52. Most cells are small. When they reach a certain size, cells typically divide. This has to do with the
a. amount of genetic material.
b. surface-to-volume ratio.
c. inability to produce more components of the cell membrane.
d. fact that they cannot possess sufficient numbers of organelles for normal cell functioning.
e. differences between viral particles and eukaryotic cells.
53. The ABO blood type gene is an example of ___________, which means that heterozygotes display two
phenotypes at the same time.
a. advanced hybridism
c. incomplete dominance