PCAT practice test questions biology || A+ Graded Already.
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which of the following is most responsible for generating genetic diversity in bacteria?
a) rapid asexual reproduction
b) environmental mutagens
c) selective mating
d) metabolic diversity correct answers environmental mutagens
during the citric acid cycle, which enzyme is responsible for syn...
which of the following is most responsible for gen
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PCAT practice test questions biology || A+ Graded Already.
which of the following is most responsible for generating genetic diversity in bacteria?
a) rapid asexual reproduction
b) environmental mutagens
c) selective mating
d) metabolic diversity correct answers environmental mutagens
during the citric acid cycle, which enzyme is responsible for synthesizing fumarate to succinate?
a) fumarase
b) malata dehydrogenase
c) succinate coenzyme Q reductase
d) citrate synthase correct answers succinate coenzyme D reductase
which of the following is not a function of the integumentary system in humans?
a) to produce vitamin D
b) to keep viruses in environment outside the body
c) insulate against heat loss
d) absorb oxygen from environment outside the body correct answers to absorb oxygen from the
environment outside of the body
in a cell with defective histones, which structure would be absent?
a) rough ER
b) discrete nucleus
c) tightly coiled DNA
d) lysosomes correct answers tightly coiled DNA
if a population is at equilibrium, the ratio of dominant to recessive genes in the gene pool tends
to remain stable from one generation to the next. the stability can be upset by:
a) large population of individuals capable of reproducing
b) absence of mutations occuring within a population
c) selective breeding among individuals in the population
d) lack of significant immigration or emigration correct answers selective breeding among
individuals in the population
genetic engineering differs from selective breeding because:
a) changes the size and vigor of an organism
b) increases the number of chromosomes in an organism
c) reduces an organisms needs for certain nutrients
d) introduces genes from a different species of organism correct answers introduces genes from a
different species of an organism
in the first stage of carbohydrate metabolism, glucose is broken down into:
a) citric acid
b) lactic acid
c) pyruvic acid
, d) uric acid correct answers pyruvic acid
the exposure time at a given temperature needed to reduce the number of microorganisms by
90% is called:
a) decimal reduction time
b) time constant
c) phenol coefficient
d) toxicity index correct answers decimal reduction time
glycoproteins produced by virus-infected cells that signal neighboring tissues to resist infection
are known as:
a) interferons
b) lymphocytes
c) histamine
d) T cells correct answers interferons
which parasite causes malaria?
a) trypanosoma gambiense
b) plasmodium falciparum
c) borrelia burgdorferi
d) wuchereria bancrofti correct answers plasmodium falciparum
during muscle rest, mysoin cross bridges are:
a) associated with ADP molecules
b) not attached to actin
c) releasing inorganic phosphate
d) attached to the thin filament correct answers not attached to actin
which of the following is true about muscle contractions?
a) Z lines move further apart
b) I bands shorten
c) thick filaments is composed of actin
d) actin cross bridges bind to myosin correct answers I bands shorten
which of the primary germ layers in an embryo develops into the muscles, kidneys, skeleton and
circulatory system?
a) coelom
b) mesoderm
c) ectoderm
d) endoderm correct answers mesoderm
tissues of which uterine lining are shed per month if pregnancy does not occur?
a) perimetrium
b) myometrium
c) endometrium
d) peritoneum correct answers endometrium
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