Experiments, DNA Replication, Transcription,Translation,ed

Which of the following terms means that in each molecule of DNA made during replication there is one original strand and one new strand?

• Antiparallel

• Semi-conservative

• Complementary base-pairing

Answer explanation

The term for this is semi-conservative replication. This means that during DNA replication, each new double-stranded DNA molecule consists of one original strand and one newly synthesized strand.

Insertion or deletion of at least one base so that the reading frame of the corresponding mRNA changes.

• substitution

• point mutation

• deletion

• frameshift mutation

Which of the following mutations would be MOST likely to have a harmful effect on an organism?

• a deletion of three nucleotides near the middle of a gene.
• a single nucleotide deletion in the middle of an intron.
• a single nucleotide deletion near the end of a coding sequence.
• a single nucleotide insertion downstream of, and close to, the start of the coding sequence.

How do the leading and the lagging strands differ?

• The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.

• The leading strand is synthesized at twice the rate of the lagging strand.

• The leading strand is synthesized in short fragments that are ultimately stitched together, whereas the lagging strand is synthesized continuously.

• The leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5? end.

What is meant by the description "antiparallel" regarding the strands that make up DNA?

• The twisting nature of DNA creates nonparallel strands.
• One strand is positively charged and the other is negatively charged.
• The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
• Base pairings create unequal spacing between the two DNA strands

Suppose a double-stranded DNA molecule was shown to have 15% adenine bases. What would be the expected percentage of guanine bases in that molecule?

• 15%
• 35%
• 85%
• Not enough information

What process is going on in this photo?

• Transcription

• Translation

• Replication

• All the above

What type of gene mutation has occurred here? 
T-G-A-C-C-A
T-G-A-C-C-A-A

• Base Substitution
• Base Deletion
• Base Insertion
• Frameshift 

DNA molecule segment is : TTACGCAAG
The mutated DNA segment is TTACGCAAC. This is an example of ___ mutation.

• Base Substitution
• Base Insertion
• Base Inversion
• Translocation

A substitution mutation that has no effect

on amino acids sequence

• Insertion Mutation

• Translocation

• Silent Mutation

• Deletion Mutation