19. In DNA replication, the ________ strand grows towards the replication fork,
ID: 258620 • Letter: 1
Question
19. In DNA replication, the ________ strand grows towards the replication fork, while the ________ strand grows away from the replication fork.
a. mRNA; leading
b. leading; lagging
c. leading; template
d. lagging; template
e. lagging; leading
20. Which of the following is not necessarily related to tumour formation?
a. an overactive MYC gene
b. proto-oncogenes
c. inactive tumour-suppressor genes
d. cell de-differentiation
e. metastasis
A densely staining region of highly compacted chromatin is known as ________ and is generally________.
a. heterochromatin; not transcribed
b. homochromatin; not transcribed
c. histone-dependent chromatin; transcribed
d. primary chromatin; transcribed
e. euchromatin; not transcribed
Retroviruses make ________ by the process of ________.
A) RNA copies of DNA; reverse transcription
b) DNA copies of RNA; reverse transcription
c) genetic probes; Southern blotting,
d) genetic probes; Northern blotting
e) telomerase; mutagenesis
Bacterial gene regulation occurs mainly at the ________ level.
translational, transcriptional, posttranscriptiona,l feedback inhibition, posttranslational
Explanation / Answer
19)B
In one direction DNA is replicated as continuous strand ,This is called as leading strand.Replication on the other strand occurs by the creation of many short sagments ,This is called lagging strand.
20)B
cell dedifferentiation is a process by which a cell becomes specialized in order to perform a special function as in the case of liver cell, neuron, blood cell etc
21)A
Heterochromatin is a condensed structure and is not transcribed because it is inaccessible to RNA polymerase.
22)B
A retrovirus is a virus which contains RNA as genetic material along with enzyme reverse transcriptase,It have a genome consisting of Two RNA from which they code the DNA with help of reverse transcriptase.
23)Gene regulation occurs at transcriptional level in eukaryotes by repressors as well as by transcriptional activators.
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