EBIO 2070 exam #1 clickers
questions and answers(graded
A+)
A single strand of DNA consists of all of these except?
a. phosphate group covalently bound to deoxyribose
b. 5' carbon covalently bound to phosphate group
c. deoxyribose covalently bound to N containing base
d. 3' carbon covalently bound to phosphate group
e. N containing base covalently bound to phosphate group - answer E
Energy is required to break the hydrogen bonds holding together bases in
a DNA double helix together, which pair will be the most difficult to
separate?
a. A-T
b. C-G
c. A-C
d. G-T - answer B
The sea lamprey has an unusually high G-C content in its genome, of about
65%. The frog, Xenopus laevis, has an unusually low G-C content of 40%.
Separating a 50 kilobase fragment of double stranded isolated from a
lamprey into two single strands with heat will?
a. generally require a higher temperature than a similar sized from dsDNA
fragment
b. generally require a lower temperature than a similar sized from dsDNA
fragment
c. require the same temperature as a similar sized frog dsDNA fragment
d. heat is not enough to separate all those hydrogen bonds - answer A
In a double stranded DNA molecule, N containing bases are connected by?
, a. covalent bonds to deoxyribose
b. hydrogen bonds to other N containing bases
c. covalent bonds to phosphate groups
d. a and b
e. a, b, and c - answer D
A robotic probe returns soil from Europa with bacteria containing DNA.
you culture the bacteria and isolate double stranded DNA. you discover
that the DNA is composed of 15% A, 15% C, 35% G and 35% T. which of the
following possibilities could you exclude about life on europe?
a. base pairing in the Europan DNA follows the same rules as earth DNA
b. base pairing in the Europan DNA follows different rules than earth DNA
c. europan life doesn't use DNA to store information - answer A
DNA replication occurs during ____ and results in the production of two
____.
a. mitotic phase, sister chromatids
b. mitotic phase, homologous chromosomes
c. interphase, sister chromatids
d. interphase, homologous chromosomes - answer C
In DNA replication, what happens to the original parent DNA molecule
(parent molecule = double stranded DNA molecule present before
replication starts)?
a. its two strands stay together and the copy of the parent molecule
consists of two newly synthesized daughter strands
b. the original molecule serves as a template which is eventually
destroyed once two new daughter molecules are synthesized
c. the two strands in the original molecule separate, with each serving as
a template for the newly synthesized strand
d. none of the above
e. all of the above - answer C
questions and answers(graded
A+)
A single strand of DNA consists of all of these except?
a. phosphate group covalently bound to deoxyribose
b. 5' carbon covalently bound to phosphate group
c. deoxyribose covalently bound to N containing base
d. 3' carbon covalently bound to phosphate group
e. N containing base covalently bound to phosphate group - answer E
Energy is required to break the hydrogen bonds holding together bases in
a DNA double helix together, which pair will be the most difficult to
separate?
a. A-T
b. C-G
c. A-C
d. G-T - answer B
The sea lamprey has an unusually high G-C content in its genome, of about
65%. The frog, Xenopus laevis, has an unusually low G-C content of 40%.
Separating a 50 kilobase fragment of double stranded isolated from a
lamprey into two single strands with heat will?
a. generally require a higher temperature than a similar sized from dsDNA
fragment
b. generally require a lower temperature than a similar sized from dsDNA
fragment
c. require the same temperature as a similar sized frog dsDNA fragment
d. heat is not enough to separate all those hydrogen bonds - answer A
In a double stranded DNA molecule, N containing bases are connected by?
, a. covalent bonds to deoxyribose
b. hydrogen bonds to other N containing bases
c. covalent bonds to phosphate groups
d. a and b
e. a, b, and c - answer D
A robotic probe returns soil from Europa with bacteria containing DNA.
you culture the bacteria and isolate double stranded DNA. you discover
that the DNA is composed of 15% A, 15% C, 35% G and 35% T. which of the
following possibilities could you exclude about life on europe?
a. base pairing in the Europan DNA follows the same rules as earth DNA
b. base pairing in the Europan DNA follows different rules than earth DNA
c. europan life doesn't use DNA to store information - answer A
DNA replication occurs during ____ and results in the production of two
____.
a. mitotic phase, sister chromatids
b. mitotic phase, homologous chromosomes
c. interphase, sister chromatids
d. interphase, homologous chromosomes - answer C
In DNA replication, what happens to the original parent DNA molecule
(parent molecule = double stranded DNA molecule present before
replication starts)?
a. its two strands stay together and the copy of the parent molecule
consists of two newly synthesized daughter strands
b. the original molecule serves as a template which is eventually
destroyed once two new daughter molecules are synthesized
c. the two strands in the original molecule separate, with each serving as
a template for the newly synthesized strand
d. none of the above
e. all of the above - answer C
