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SAT Biology (Molecular) → SAT Biology (Molecular) practice test paper questions from 81 to 90

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81. Which of the bonding examples below is NOT possible?
(A) a DNA adenine to a DNA thymine
(B) a DNA adenine to an RNA thymine
(C) a DNA guanine to an RNA cytosine
(D) a DNA adenine to an RNA uracil
(E) a DNA guanine to a DNA cytosine

82. Which of the following replaces guanine in RNA?
(A) adenine
(B) thymine
(C) cytosine
(D) uracil
(E) none of the above

83. Which of the following statements is true about mutations?
(A) Rates tend to be very high in most populations
(B) generally lethal
(C) irreversible
(D) Only certain gene locations are affected
(E) source of genetic variation

84. Which of the following have a visceral mass and a muscular foot?
(A) Medusoids
(B) Annelida
(C) Aschelminthes
(D) Mollusca
(E) Arthropoda

85. Which of the following is radially symmetrical and possesses nematocysts?
(A) Porifera
(B) Coelenterates
(C) Mollusca
(D) Amphibians
(E) Polychaetes

86. Which of the following is NOT indicated by Mendel’s experiments?
(A) incomplete dominance
(B) segregation
(C) recessive
(D) dominant
(E) independent assortment

87. A ratio of 3:1 in the phenotype of an organism occurs when
(A) the alleles are incompletely dominant
(B) only recessive traits are involved
(C) only dominant traits are involved
(D) alleles segregate during meiosis
(E) crossing over has occurred in Anaphase II

88. Colorblindness in humans is
(A) caused by a recessive allele
(B) in equal proportion in both sexes
(C) caused in females by a heterozygous genotype
(D) inherited by males from their male parent
(E) caused in males by a homozygous genotype

89. Trisomy 21 in humans is the result of
(A) pleiotropy
(B) polygenic inheritance
(C) epistasis
(D) x-inactivation
(E) nondisjunction

90. Homologous chromosomes line up in pairs in
(A) metaphase of mitosis
(B) metaphase I
(C) metaphase II
(D) interphase
(E) prophase of mitosis

ANSWERS: SAT BIOLOGY E/M PRACTICE PAPER
81. B
82. E
83. C
84. D
85. B
86. A
87. D
88. A
89. E
90. B