A student is building a model of a parallel circuit consisting of a battery, a switch, five light bulbs, and wires. When she con
nects all of the components of her model, none of the bulbs light up. Which of the following could be the problem with her model?
1 One of the bulbs is burnt
out
2One or more of the wires is not connected to the battery
3The switch isn't properly closed
4The resistance of the light bulbs prevents current from flowing through the circuit
O A 1, 2, and 4
OB 1, 2, and 3
OC. 1, 3, and 4
OD. 2, 3, and 4
A change in the DNA sequence of a gene leads to a change in the nucleotide sequence in the messenger RNA, which can lead to a change in the amino acid sequence of the resulting protein.
