BSC2010 Unit 2 Exam Questions With Complete Solutions
A diploid somatic ("body") cell has 2n = 20 chromosomes. At
the end of mitosis, each daughter cell would have ______
chromosomes. At the end of meiosis I, each daughter cell would
have ______ chromosomes. At the end of meiosis II, each
daughter cell would have ______ chromosomes.
A. 2n=20, 2n=20, n=10
B. 2n=20, 2n=10, n=10
C. n=10, n=10, n=10
D. 2n=20, 2n=20, n=20
E. 2n=20, n=10, n=10 Correct Answers E. 2n=20, n=10, n=10
A DNA sequence is several thousands of nucleotides distant
from the promoter. When this sequence is bound by a protein,
transcription rates increase greatly. This sequence is most likely
a(n)
A. silencer
B. enhancer
C. operon
D. promoter
E. consensus sequence Correct Answers B. enhancer
A double stranded DNA molecule contains 300 adenine
molecules and 240 cytosine molecules. How many guanine
molecules are in this molecule? Correct Answers 24O
,A particular triplet of bases in the template strand of DNA is 5′-
AGT-3′. What would be the corresponding codon for the mRNA
that is transcribed?
A. 3′-UCA-5′
B. 3′-ACU-5′
C. 5′-TCA-3′
D. 3′-UGA-5′ Correct Answers A. 3′-UCA-5′
A strand of DNA with the sequence 5′-ATTCCG-3′ would have
a complementary strand with the sequence
A. 5′-TAAGGC-3′.
B. 5′-ATTCCG-3′.
C. 5′-ACCTTA-3′.
D. 5′-CGGAAT-3′
E. 5′-GCCTTA-3′ Correct Answers D. 5′-CGGAAT-3′
A true-breeding strain of tall soybean plants is crossed with a
true-breeding strain of short soybean plants. All the offspring are
short. These offspring are then crossed with each other to create
an F2 generation. If the height of soybean plants is due to a
single gene, then of 200 F2 plants, _______ should be tall.
Correct Answers 50
(1:2:1)
Achondroplasia is a dominant affliction that causes dwarfism. A
heterozygous man mates with a phenotypically tall woman.
What is the probability their first child will have
achondroplasia?
, A. 0%
B. 25%
C. 50%
D. 75%
E. 100%
F. Cannot be determined Correct Answers C. 50%
Administration of a drug that inhibits the action of motor
proteins moving towards the plus ends of their respective
cytoskeletal elements would affect which of the following?
Choose all that apply.
A. Formation of the mitotic spindles
B. Movement of a pair of sister chromatids away from each
other to
opposite poles
C. Movement of a pair of sister chromatids back and forth across
the cell, resting at the metaphase plate
D. Division of the cytoplasm into two daughter cells
E. Movement of astral microtubules, serving to distance spindle
poles further from each other Correct Answers C. Movement
of a pair of sister chromatids back and forth across
the cell, resting at the metaphase plate
D. Division of the cytoplasm into two daughter cells
At which of the numbered regions would you expect to find
cells at metaphase?
A. and IV
B. II only
C. III only
A diploid somatic ("body") cell has 2n = 20 chromosomes. At
the end of mitosis, each daughter cell would have ______
chromosomes. At the end of meiosis I, each daughter cell would
have ______ chromosomes. At the end of meiosis II, each
daughter cell would have ______ chromosomes.
A. 2n=20, 2n=20, n=10
B. 2n=20, 2n=10, n=10
C. n=10, n=10, n=10
D. 2n=20, 2n=20, n=20
E. 2n=20, n=10, n=10 Correct Answers E. 2n=20, n=10, n=10
A DNA sequence is several thousands of nucleotides distant
from the promoter. When this sequence is bound by a protein,
transcription rates increase greatly. This sequence is most likely
a(n)
A. silencer
B. enhancer
C. operon
D. promoter
E. consensus sequence Correct Answers B. enhancer
A double stranded DNA molecule contains 300 adenine
molecules and 240 cytosine molecules. How many guanine
molecules are in this molecule? Correct Answers 24O
,A particular triplet of bases in the template strand of DNA is 5′-
AGT-3′. What would be the corresponding codon for the mRNA
that is transcribed?
A. 3′-UCA-5′
B. 3′-ACU-5′
C. 5′-TCA-3′
D. 3′-UGA-5′ Correct Answers A. 3′-UCA-5′
A strand of DNA with the sequence 5′-ATTCCG-3′ would have
a complementary strand with the sequence
A. 5′-TAAGGC-3′.
B. 5′-ATTCCG-3′.
C. 5′-ACCTTA-3′.
D. 5′-CGGAAT-3′
E. 5′-GCCTTA-3′ Correct Answers D. 5′-CGGAAT-3′
A true-breeding strain of tall soybean plants is crossed with a
true-breeding strain of short soybean plants. All the offspring are
short. These offspring are then crossed with each other to create
an F2 generation. If the height of soybean plants is due to a
single gene, then of 200 F2 plants, _______ should be tall.
Correct Answers 50
(1:2:1)
Achondroplasia is a dominant affliction that causes dwarfism. A
heterozygous man mates with a phenotypically tall woman.
What is the probability their first child will have
achondroplasia?
, A. 0%
B. 25%
C. 50%
D. 75%
E. 100%
F. Cannot be determined Correct Answers C. 50%
Administration of a drug that inhibits the action of motor
proteins moving towards the plus ends of their respective
cytoskeletal elements would affect which of the following?
Choose all that apply.
A. Formation of the mitotic spindles
B. Movement of a pair of sister chromatids away from each
other to
opposite poles
C. Movement of a pair of sister chromatids back and forth across
the cell, resting at the metaphase plate
D. Division of the cytoplasm into two daughter cells
E. Movement of astral microtubules, serving to distance spindle
poles further from each other Correct Answers C. Movement
of a pair of sister chromatids back and forth across
the cell, resting at the metaphase plate
D. Division of the cytoplasm into two daughter cells
At which of the numbered regions would you expect to find
cells at metaphase?
A. and IV
B. II only
C. III only
