In classical physics, light is viewed as part of the electromagnetic spectrum, traveling in
the form of transverse waves. Quantum physics proposes that light is composed of
quanta called
answer: photons
Enzymes that are involved in biochemical reactions are organic
answer: catalysts
How much current is drawn by a light bulb that has a resistance of 100 R with a voltage
of 110 V? (V = IR)
answer: 1.1 amperes
The bending of a wave around an obstacle is known as
A.) diffraction.
B.) deflection.
C.) refraction.
D.) reflection.
answer: Diffraction
Iodize salt is used to prevent a human condition known as
A.) rickets.
B.) goiter.
C.) scurvy.
D.) beri-beri
answer: goiter
Sodium will react most readily with
answer: chlorine
The watt is a unit of
answer: power
To determine the optimum conditions for the activity of a digestive enzyme, it would be
necessary to test its activity over a range of
answer: temperature, pH and substrate concentration.
Which of these findings suggests a serious illness from a urinalysis?
answer: Presence of glucose and protein.
As part of the human immune response, which of these cells are responsible for
producing antibodies?
answer: lymphocytes
A cell which manufactures a large amount of protein for export would have an
abundance of organelles called
answer: ribosomes
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An
immediate remedy is to
A.) have her bend forward and tell her to cough.
B.) insert a finger or a blunt object toward the back of the mouth.
C.) apply quick, hard pressures successively to her abdomen, just beneath her
diaphragm.
D.) phone “emergency” for help.
answer: apply quick, hard pressures successively to her abdomen, just beneath her
diaphragm.
Which of these processes is used to free contaminated water of bacteria?
A.) Filtering.
B.) Passing it through charcoal.
C.) Treating it with chlorine.
D.) Allowing it to settle.
answer: Treating it with chlorine
Which of these structures contains valves to prevent blood from flowing in the wrong
direction?
A.) Veins.
B.) Arteries.
C.) Capillaries.
D.) Lymph ducts.
answer: Veins
Which of these structures of the male reproductive system carries sperm cells from the
testes to the lower part of the abdomen?
A.) Urethra.
B.) Seminiferous tubules.
C.) Epididymis.
D.) Vas deferens.
Vas deferens.
If a red light is passed through a dilute solution of chlorophyll solution, the
spectrophotometer will detect what amount of transmittance of this light?
A.) 100%
B.) 50 – 75%
C.) Less than 25%
D.) None
answer: 50 – 75%
In diagnostic testing, the electroencephalogram permits the physician to
A.) examine the impulses of the specialized muscle cells of the heart.
B.) examine the impulses of the nerve cells within the brain.
C.) measure the pressure within the eye.
D.) measure the amount of air upon exhalation.
answer: examine the impulses of the nerve cells within the brain.
To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If
unavailable, the next most effective method to sterilize the instrument would be
A.) boiling it in water for 15 minutes.
B.) dipping it into a concentrated acid solution.
C.) heating it in a hot air oven at 160\u00b0C for 20 minutes.
D.) washing it in soap and water.
answer: boiling it in water for 15 minutes.
In varieties of matter, the term heterogeneous may be applied to
A.) elements, but not compounds.
B.) compounds, but not elements.
C.) compounds and elements, but not mixtures.
D.) mixtures, but not elements or compounds.
answer: mixtures, but not elements or compounds.
Heat energy is absorbed in which of these phase changes?
A.) Br2 (l) -> Br2(s)
B.) Br2 (g) –> Br2(l)
C.) Br2 (l) -> Br2(g)
D.) Br2 (g) -> Br2(s)
answer: Br2 (l) -> Br2(g)
Periodontitis is an inflammatory condition of the
A.) gum tissue that surrounds the neck of each tooth.
B.) pulp that contains nerve cells and blood vessels of the tooth.
C.) dentin that surrounds the soft part of a tooth.
D.) enamel that provides a hard surface for chewing.
answer: gum tissue that surrounds the neck of each tooth.
The atoms of an element with seven valence electrons are most probably classified as
A.) metals.
B.) nonmetals.
C.) metalloids.
D.) noble gases.
answer: nonmetals.
The inherited factors that are transmitted in an organism from generation to generation
are called its
A.) homozygote.
B.) heterozygote.
C.) genotype.
D.) phenotype.
answer: genotype.
The process of nuclear cell division in the cell reproduction of plants differs from
mammals. A major difference is that
A.) homologous chromosomes are paired.
B.) centrioles are replicated.
C.) spindle fibers are missing.
D.) cell plates are synthesized.
answer: cell plates are synthesized.
Unicellular organisms that have a nucleus and can swim with the aid of cilia are
examples of
A.) monerans.
B.) plants.
C.) fungi.
D.) protozoans.
answer: protozoans
.
Which of these conditions is associated with smoking?
A.) Esophageal varices.
B.) Tonsillitis.
C.) Emphysema.
D.) Blindness.
answer: Emphysema.
Which of these equations best illustrates a synthesis reaction?
A.) 2Na + Cl2 -> 2NaCl
B.) NaOH + HCl -> NaCl + H2O
C.) 2H2O2 -> 2H2O + O2<\/p>\n","protected":false},"excerpt":{"rendered":"
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