What is the name of the enzyme that “unzips” DNA during DNA replication?

The figures below show four processes involving DNA and RNA. Which figure shows the process of replication? test 3 figure pic(1).jpg

The model represents the change in the DNA content of a cell during the cell cycle. Which part of the model represents the S phase? s phase pic test 3.jpg

trisomy 21 karyotype test 3.jpg What is the name of the image above? Hint: picture of chromosomes.

Process where egg and sperm combine

Which sequence represents the correct order of processes that result in the formation and development of an embryo?

In 1952 Rosalind Franklin took the x-ray photograph shown below How did this evidence affect the work of Watson & Crick? photo 51 for test 3 pic(1).jpg

A base sequence is shown below. ACAGTGC How would the base sequence be coded on mRNA?

Which of the following is matched correctly with its function?

What is the main defense against viruses?