1973_MCBIOLOGY.pdf.pdf Page 1 of 20 1973_MCBIOLOGY.pdf.pdf
BIOLOGY
SECTION I
Time—1 hour and 30 minutes
Directions: Each of the questions or incomplete statements below is followed by five suggested answers or
completions. Select the .one that is best in each case and then fill in the corresponding oval on the answer
sheet.
1. The principal components of viruses are
(A) protein and lipid
(B) DNA and RNA
(C) RNA and lipid
(D) DNA and carbohydrate
(E) protein and nucleic acid
2. The primary producer in a food chain is usually
(A) xerophytic
(B) heterotrophic
(C) chemosynthetic
(D) saprophytic
(E) autotrophic
3. In his experiments with garden peas, Mendel demonstrated that
(A) peas have seven pairs of chromosomes
(B) each allele he studied was located on a different chromosome
(C) the same principles of genetics apply to peas and to man
(D) recessive alleles retain their fundamental natures even when unexpressed
(E) hybridization is essential for propagation of peas to occur
4. Under optimal conditions. the number of bacterial cells increases most rapidly as a result of
(A) asexual reproduction
(B) sexual reproduction
(C) endospore germination
(D) budding
(E) cyst formation
5. Some species of land plants are capable of surviving unfavorable environmental conditions by all of
the following adaptations EXCEPT the
(A) storage of foods in various parts of a plant
(B) production of seeds
(C) increased production of new kinds of photosynthetic pigments
(D) loss of leaves
(E) formation of buds
6. Which of the following is the most important role of bacteria and fungi in a community of living
organisms?
(A) Fixation of nitrogen
(B) Synthesis of antibiotics
(C) Decomposition of organic materials
(D) Causation of disease
(E) Alcoholic fermentation
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
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7. One of the usual characteristics of sewage-pollute waters is
(A) a low turbidity
(B) a low oxygen content
(C) a wide variety of aquatic wildlife
(D) the absence of gas-forming bacteria
(E) a relatively high temperature
8. The first man to present convincing evidence that the blood circulates rather than merely surging back
and forth was
(A) Darwin
(B) Redi
(C) Pasteur
(D) Harvey
(E) Vesalius
9. The most critical characteristic used by taxonomists to determine whether tWo animals are mem bers
of the same species is the
(A) similarity in embryonic development
(B) similarity in structure
(C) similarity in behavior patterns
(D) distribution into a definite geographical area
(E) ability to interbreed freely
10. In a transfusion of blood which of the following should the recipient have?
(A) Antibodies in his plasma against the type of antigen in the donor's white cells
(B) The same antibodies as the donor but different antigens
(C) Type 0 blood if that of the donor is not known
(D) The same antigens as the donor
(E) Antibodies in his plasma against the type of antigen in the donor's red cells
11. All of the following generalizations are consistent with the physical and chemical factors found in a
food chain EXCEPT:
(A) The secondary consumers are usually larger in size than the primary consumers.
(B) The biomass of a food chain is greatest at the producer level.
(C) An increase in the number of organisms occurs in successive links of the food chain.
(D) The amount of available energy decreases in successive links of the food chain.
(E) The available energy in a food chain is limited by the total amount of photosynthesis.
12. The application of a paste containing IAA (auxin) in low concentration near the tip of the stem of a
young pea seedling growing in diffuse light would be expected to result in the
(A) inhibition of elongation of the stem
(B) inhibition of elongation of the root
(C) bending of the stem toward the side on which the paste-had been applied
(D) bending of the stem away from the side on which the paste had been applied
(E) stimulation of bud development
13. There is good evidence of linkage when
(A) genes of two different loci segregate independently
(B) genes of two different loci do not segregate independently
(C) a gene is invariably associated with a specific characteristic
(D) two genes invariably work together to control the expression of a single characteristic
(E) two genes are located together in a single gamete
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
, 1973_MCBIOLOGY.pdf.pdf Page 3 of 20 1973_MCBIOLOGY.pdf.pdf
14. The lysosome has a high content of
(A) enzymes
(B) cytochromes
(C) DNA
(D) chlorophyll
(E) ribosomes
15. The evolution of flowering plants involved all of the following trends EXCEPT
(A) an increase in the relative size of the gametophyte generation
(B) an increase in the complexity of the sporophyte generation
(C) increased dependence of the gametophyte generation on the sporophyte generation
(D) the development of vascular tissue
(E) the loss of sperm flagella
16. In a diploid organism with the genotype AaBBCCDDEE, how many genetically distinct kinds of
gametes would be produced?
(A) 2
(B) 4
(C) 8
(D) 16
(E) 32
17. If a particular recessive allele of a gene pair in a population exists at a frequency of 0.4, and the other
allele shows complete dominance, the dominant phenotype is seen in what percentage of the
individuals in this population?
(A) 4%
(B) 16%
(C) 36
(D) 64%
(E) 84%
18. The cyclical nature of the estrous cycle in mammals is maintained by a feed- back system between the
(A) ovary, anterior pituitary, and hypothalamus
(B) ovary, placenta, and uterus
(C) placenta, anterior pituitary, and oviducts
(D) ovary, posterior pituitary, and uterus
(E) ovary, the lining of the uterus, and hypothalamus
19. In general, birds differ from mammals in that birds
(A) are homeotherms
(B) have four-chambered hearts
(C) have hepatic portal veins
(D) develop without an amnion
(E) excrete waste nitrogen as uric acid
20. Which of the following would NOT increase the rate of transpiration in an angiosperm?
(A) Morning sunshine
(B) An increase in temperature from 200°C to 300°C
(C) An increase in relative humidity
(D) An increase in the water content of the soil
(E) An increase in air velocity
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
BIOLOGY
SECTION I
Time—1 hour and 30 minutes
Directions: Each of the questions or incomplete statements below is followed by five suggested answers or
completions. Select the .one that is best in each case and then fill in the corresponding oval on the answer
sheet.
1. The principal components of viruses are
(A) protein and lipid
(B) DNA and RNA
(C) RNA and lipid
(D) DNA and carbohydrate
(E) protein and nucleic acid
2. The primary producer in a food chain is usually
(A) xerophytic
(B) heterotrophic
(C) chemosynthetic
(D) saprophytic
(E) autotrophic
3. In his experiments with garden peas, Mendel demonstrated that
(A) peas have seven pairs of chromosomes
(B) each allele he studied was located on a different chromosome
(C) the same principles of genetics apply to peas and to man
(D) recessive alleles retain their fundamental natures even when unexpressed
(E) hybridization is essential for propagation of peas to occur
4. Under optimal conditions. the number of bacterial cells increases most rapidly as a result of
(A) asexual reproduction
(B) sexual reproduction
(C) endospore germination
(D) budding
(E) cyst formation
5. Some species of land plants are capable of surviving unfavorable environmental conditions by all of
the following adaptations EXCEPT the
(A) storage of foods in various parts of a plant
(B) production of seeds
(C) increased production of new kinds of photosynthetic pigments
(D) loss of leaves
(E) formation of buds
6. Which of the following is the most important role of bacteria and fungi in a community of living
organisms?
(A) Fixation of nitrogen
(B) Synthesis of antibiotics
(C) Decomposition of organic materials
(D) Causation of disease
(E) Alcoholic fermentation
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
,1973_MCBIOLOGY.pdf.pdf Page 2 of 20 1973_MCBIOLOGY.pdf.pdf
7. One of the usual characteristics of sewage-pollute waters is
(A) a low turbidity
(B) a low oxygen content
(C) a wide variety of aquatic wildlife
(D) the absence of gas-forming bacteria
(E) a relatively high temperature
8. The first man to present convincing evidence that the blood circulates rather than merely surging back
and forth was
(A) Darwin
(B) Redi
(C) Pasteur
(D) Harvey
(E) Vesalius
9. The most critical characteristic used by taxonomists to determine whether tWo animals are mem bers
of the same species is the
(A) similarity in embryonic development
(B) similarity in structure
(C) similarity in behavior patterns
(D) distribution into a definite geographical area
(E) ability to interbreed freely
10. In a transfusion of blood which of the following should the recipient have?
(A) Antibodies in his plasma against the type of antigen in the donor's white cells
(B) The same antibodies as the donor but different antigens
(C) Type 0 blood if that of the donor is not known
(D) The same antigens as the donor
(E) Antibodies in his plasma against the type of antigen in the donor's red cells
11. All of the following generalizations are consistent with the physical and chemical factors found in a
food chain EXCEPT:
(A) The secondary consumers are usually larger in size than the primary consumers.
(B) The biomass of a food chain is greatest at the producer level.
(C) An increase in the number of organisms occurs in successive links of the food chain.
(D) The amount of available energy decreases in successive links of the food chain.
(E) The available energy in a food chain is limited by the total amount of photosynthesis.
12. The application of a paste containing IAA (auxin) in low concentration near the tip of the stem of a
young pea seedling growing in diffuse light would be expected to result in the
(A) inhibition of elongation of the stem
(B) inhibition of elongation of the root
(C) bending of the stem toward the side on which the paste-had been applied
(D) bending of the stem away from the side on which the paste had been applied
(E) stimulation of bud development
13. There is good evidence of linkage when
(A) genes of two different loci segregate independently
(B) genes of two different loci do not segregate independently
(C) a gene is invariably associated with a specific characteristic
(D) two genes invariably work together to control the expression of a single characteristic
(E) two genes are located together in a single gamete
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
, 1973_MCBIOLOGY.pdf.pdf Page 3 of 20 1973_MCBIOLOGY.pdf.pdf
14. The lysosome has a high content of
(A) enzymes
(B) cytochromes
(C) DNA
(D) chlorophyll
(E) ribosomes
15. The evolution of flowering plants involved all of the following trends EXCEPT
(A) an increase in the relative size of the gametophyte generation
(B) an increase in the complexity of the sporophyte generation
(C) increased dependence of the gametophyte generation on the sporophyte generation
(D) the development of vascular tissue
(E) the loss of sperm flagella
16. In a diploid organism with the genotype AaBBCCDDEE, how many genetically distinct kinds of
gametes would be produced?
(A) 2
(B) 4
(C) 8
(D) 16
(E) 32
17. If a particular recessive allele of a gene pair in a population exists at a frequency of 0.4, and the other
allele shows complete dominance, the dominant phenotype is seen in what percentage of the
individuals in this population?
(A) 4%
(B) 16%
(C) 36
(D) 64%
(E) 84%
18. The cyclical nature of the estrous cycle in mammals is maintained by a feed- back system between the
(A) ovary, anterior pituitary, and hypothalamus
(B) ovary, placenta, and uterus
(C) placenta, anterior pituitary, and oviducts
(D) ovary, posterior pituitary, and uterus
(E) ovary, the lining of the uterus, and hypothalamus
19. In general, birds differ from mammals in that birds
(A) are homeotherms
(B) have four-chambered hearts
(C) have hepatic portal veins
(D) develop without an amnion
(E) excrete waste nitrogen as uric acid
20. Which of the following would NOT increase the rate of transpiration in an angiosperm?
(A) Morning sunshine
(B) An increase in temperature from 200°C to 300°C
(C) An increase in relative humidity
(D) An increase in the water content of the soil
(E) An increase in air velocity
1973_MCBIOLOGY.pdf.pdf 1973_MCBIOLOGY.pdf.pdf 2026/2027
