MicroRNA (miRNA) regulates gene expression by: A) inhibiting transcription. B) i

Question

MicroRNA (miRNA) regulates gene expression by: A) inhibiting transcription. B) inhibiting splicing. C) inhibiting translation by binding to RNA transcripts. D) inhibiting translation by degrading RNA transcripts. E) inhibiting rRNA synthesis. Which of the following statements about mitosis is true? A) The chromosome number in the resulting cells is halved. B) DNA replication is completed in prophase. C) Crossing over occurs during prophase. D) Two genetically identical daughter cells are formed. E) It consists of two nuclear divisions. What volume of water would you need to make a 0.2 M solution if you used 10 g of a compound to make the solution? The compound has a molecular weight of 100 Datons (g/mol). A) 100 ml. B) 200 ml. C) 300 ml D) 400 ml. E) 500 ml. A reaction that has a negative delta G A) is endergonic. B) will proceed more rapidly than a reaction with a less negative delta G. C) is spontaneous. D) cannot be used to drive a reaction with a posi

Explanation / Answer

28.The correct answer is:D) Inhibiting translation by degrading RNA transcripts.

Reason:miRNA binds to specific sequences on complementary mRNA and degrades them thus inhibiting translation.

29.The correct answer is:D) Two genetically identical daughter cells are formed.

Reason:Of all the options given,above option is correct.

30.The correct answer is:E) 500 ml

Reason:

Molarity (M) = weight * 1000 / molecular mass *Volume in ml

0.2 = 10 *1000 / 100* Volume

Volume = 500ml ( ans)

31.The correct answer is:C) is spontaneous

Reason:Negative delta G means reaction is exergonic and spontaneous.

32.The correct answer is: D)Chlorophyll is oxidised.

Reason:Chlorophyll molecule becomes excited and loses an electron that is transferred to other molecules.Thus chlorophyll is said to be oxidised.

33.The correct answer is : B)Sequence of bases.

Reason:Three specific sequences of DNA bases together is known as a codon that codes for an aminoacid of proteins.

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