'Helicase "unzips" the DNA strand, while DNA polymerase brings in new strands of DNA to match the old strands.' best describes the role of helicase and DNA polymerase in DNA replication. The correct option is d.
Helicase is essential for DNA replication because it "unzips" the double-stranded DNA molecule. In order to separate the two strands and create a replication fork this process involves severing hydrogen bonds between the base pairs. On the other hand, DNA polymerase is charged with the vital task of creating new DNA strands.
It does this by incorporating complementary nucleotides into the template strands already present. This maintains genetic fidelity by ensuring that the newly formed strands mirror the original ones. The precise duplication of genetic information which is necessary for cell division and inheritance, depends on the interaction between the unwinding action of the helicase and the strand-building activity of DNA polymerase.
To know more about DNA replication here
#SPJ3
b. evolution.
c. variation.
d. adaptation.
In a biological context, 'change over time' refers to evolution. Evolution is a process by which living organisms have developed and diversified from earlier forms over time. Mutation, variation, and adaptation are components of this process.
The term 'change over time' in biology usually refers to the concept of evolution. Evolution can be defined as the process by which different kinds of living organisms have developed and diversified from earlier forms during the history of earth. This involves slow changes happening in species over long periods. This could be due to factors like genetic variation, environmental changes, and natural selection.
On the other hand, mutation, variation, and adaptation are components of evolution. A mutation is a change within the DNA of a gene. A variation represents the differences within a species, and adaptation is the process where an organism adjusts to its environment over time for survival.
#SPJ6
The respiratory and circulatory system work together to deliver oxygen to body cells.
The respiratory and circulatory systems work together to deliver oxygen to body cells. The respiratory system is responsible for breathing in oxygen and expelling carbon dioxide, while the circulatory system transports oxygen-rich blood to the cells. Within the circulatory system, the heart pumps oxygenated blood through arteries to the body's tissues, where oxygen is delivered to the cells through capillaries.
#SPJ6