MICRO BIOLOGY

1) A microorganism has the following characteristics: eukaryotic,
multicellular, has cell walls, and grows in long filaments. What is
its general classification?
bacterium fungus protozoan parasitic worm

fungus

2) You have isolated microorganisms that are green, photosynthetic,
have a cell wall, and do NOT possess a nucleus. These organisms are __________.
bacteria archaea fungi algae

bacteria

3)Which of the following is NOT an example of a fungus?
algae mushrooms yeasts molds

algae

4)Microbiologists study parasitic worms because __________.
they usually contain bacteria and other microbes they cause
diseases that are diagnosed by finding microscopic eggs in clinical
specimens they were not studied by early microbiologists
they are microscopic as adults

they cause diseases that are diagnosed by finding microscopic eggs in
clinical specimens

5)Which of the following is a true statement concerning bacteria and archaea?
Bacteria are found only in extreme environments. While some
bacteria are pathogenic to humans, no archaea are known to cause human
diseases. Bacteria reproduce asexually, while archaea reproduce
sexually. Bacteria and archaea have identical types of cell walls.

While some bacteria are pathogenic to humans, no archaea are known to
cause human diseases.

6)When the nucleus of an atom contains a constant number of protons
but a variable number of neutrons, the atom is called a(n) __________.
isotope valence dalton element

isotope

7) Which of the following refers to the use of bacteria or other
microbes to detoxify pollutants?
biotechnology biochemistry bioremediation
recombinant DNA technology

bioremediation

8) Which field of microbiology involves the study of microorganisms
in their natural habitats?
recombinant DNA technology environmental microbiology
microbial genetics molecular biology

environmental microbiology

9) Which of the following is an accurate description of viruses?
they are visible with a light microscope. they are typically
about the size of prokaryotic cells. they are composed of
protein only. they are acellular obligatory parasites.
they are the smallest known cells.

they are acellular obligatory parasites.

10) Which of the following is an incorrect pairing?
fungi; cell walls prokaryotes; no nuclei algae; aquatic
and marine habitats viruses; acellular parasites protozoa; multicellular

protozoa; multicellular

11) A tiny (less than 2 micrometers) new organism is discovered
living in a boiling hot "mud pot" (a type of mud spring). It
is most likely a member of the
fungi. algae. viruses. protozoa. archaea.

archaea.

12) Parasitic worms, even meters-long tapeworms, are studied in
microbiology because
the Gram stain can be used to identify them. they are
parasites. no one else wants to study them. diagnosis
usually involves microscopic examination of patient samples.
Leeuwenhoek first discovered them.

diagnosis usually involves microscopic examination of patient

13) Which of the following is NOT a characteristic of protozoa?
they frequently possess cilia or flagella. they are eukaryotic
organisms. they are single-celled organisms. most exhibit
asexual reproduction. they are all photosynthetic.

they are all photosynthetic.

14) The microbes commonly known as ________ are single-celled
eukaryotes that are generally motile.
bacteria fungi archaea viruses protozoa

protozoa

15) Microorganisms characterized by the absence of a nucleus are called
eukaryotes. pathogens. fungi. viruses. prokaryotes.

prokaryotes.

16) Identification of bacteria in the laboratory usually begins with
the ________ for placement in one of two large groups of bacteria.
Gram stain Petri stain Koch's stain Pasteur
fermentation test Ehrlich magic test

Gram stain

17) The term for the use of microorganisms to restore damaged
environments is
epidemiology. bioremediation. chemotherapy.
serology. ecology.

bioremediation.

18) The control of infectious disease remains challenging a century
after the understanding of infectious disease began. What contributes
to the continuing challenge?
rapidly growing estimates of the diversity of microbes
emerging diseases creating microbes using recombinant DNA
technology developing resistance to antimicrobial agents
both drug-resistant pathogens and emerging diseases

both drug-resistant pathogens and emerging diseases

19) Microbiologists study only single-celled organisms.TrueFalse

FALSE

20) A microbe with a cell wall and no internal membrane enclosing the
DNA is a prokaryote.TrueFalse

TRUE

21) Which of the following is a particle found in the nucleus of an
atom and that has no electrical charge?
element electron proton isotope neutron

neutron

22) A stable atom has ________ in its valence shell.
8 protons 4 electrons 2 neutrons 10 electrons
8 electrons

8 electrons

23)Which of the following is found only in eukaryotic cells?
Cytoplasm Cytoplasmic membrane Nuclear envelope
Ribosomes DNA

Nuclear envelope

24)Which parts of the atoms interact in a chemical reaction?
ions electrons protons isotopes neutrons

electrons

25) The type(s) of bonds produced when atoms share electrons equally is/are
a polar covalent bond. an ionic bond. a hydrogen bond.
a nonpolar covalent bond. both polar covalent and ionic bond

a nonpolar covalent bond.

26) The type(s) of bond produced when atoms with somewhat different
electronegativities share electrons is/are
an ionic bond. a polar covalent bond. a nonpolar
covalent bond. a hydrogen bond. both nonpolar covalent and
ionic bonds.

a polar covalent bond.

27) Compounds that readily dissociate in water are Compounds
that readily dissociate in water areionic. nonpolar.
polar. either polar or ionic. never polar or ionic.

either polar or ionic.

28) Which of the following is a property of water?
it is liquid in a very narrow temperature range. it is a
nonpolar molecule. it is not a common reactant in metabolic
reactions. It is not a good solvent. it has a high
capacity for heat.

it has a high capacity for heat.

29) An acid dissociates in water to releaseanions.
hydroxyl groups. cations. hydrogen ions. both
anions and hydrogen ions.

both anions and hydrogen ions.

30) The reverse of a dehydration synthesis reaction is a(n) ________ reaction.
hydrolysis exchange anabolic endothermic metabolic

hydrolysis

31) A hydroxyl ________ acts as a base.
salt atom anion group cation

anion

32) Nucleic acid polymers, proteins, and complex carbohydrates are
all produced by
hydrogen bonding. dehydration synthesis. exchange
reactions. catabolic reactions. hydrolytic reactions

dehydration synthesis.

33) Research suggests taking antacids may make people more
susceptible to infection with Vibrio vulnificus by making the stomach
environment more tolerable to the bacteria. Based on this information
and the name "antacid," which of the following are antacids
likely to be?
bases buffers non-polar compounds acids
either base or buffer

either base or buffer

34) All of the following are components of an amino acid EXCEPT a(n)
amino group. ?-carbon. pentose group. carboxyl
group. R group.

pentose group.

35) The "backbone" of the DNA molecule is composed of
pentoses. phosphates. nitrogenous bases.
alternating phosphates and pentoses. amino acids.

alternating phosphates and pentoses.

36) Proteins contain both acidic and basic R groups, and can
therefore function ascatalysts. energy storage
macromolecules. genetic material. buffers.
structural macromolecules.

buffers.

37)Bacterial cell walls are composed of
polysaccharides. carbohydrates and waxes. peptides.
peptides and polysaccharides. waxes.

peptides and polysaccharides.

38) A reaction requires water as a reactant and produces heat. What
type of reaction is likely to be involved?
a synthesis reaction an exchange reaction a
decomposition reaction a hydrolysis reaction The answer
cannot be determined with the available information.

a decomposition reaction

39) What functional groups are present in ALL amino acids?
amino and sulfhydryl groups. amino and carboxyl groups
carboxyl groups amino groups hydroxyl groups.

amino and carboxyl groups