Answer: B The Geological Time Scale
Explanation:
The statement which best describes cancer cells is that: D. They are not regulated by contact inhibition.
Cancer can be defined as the uncontrolled division of certain bodycells, which then invade the surrounding tissues of the body and interfere with the body's normal function.
Basically, cancer cells are caused when various body cells grow and divide more than they are required or they fail to when necessary (required).
Generally, some examples of cancer are:
The growth and division of body cells is controlled by cyclin-dependent protein kinases (Cdks) and regulated by subunits called cyclins during contact inhibition.
In conclusion, cancer cells are caused when body cells are not regulated by contact inhibition, which may be due to exposure to extremely dangerous radioactive substances such as gamma ray, uranium etc.
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B. Helicase attaches new nitrogen bases to the ends of old DNA strands, while DNA polymerase breaks down unused DNA strands
C . DNA polymerase breaks down the old strand of DNA after a new one has been replicated, while helicase connects the two DNA strands together
D. Helicase "unzips" the DNA strand, while DNA polymerase brings in new strands of DNA to match the old strands
'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.
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Answer:
Hypothalamus
Explanation:
The cell bodies of the neurosecretory cells of the paraventricular and the supraoptic nuclei of the hypothalamus synthesize the hormones oxytocin and antidiuretic hormone (ADH), also called vasopressin. These hormones are stored and released in blood by the posterior pituitary gland. The posterior pituitary does not synthesize hormones.
The hormones from the hypothalamus are packed into vesicles and are transported to the axon terminals of the posterior pituitary via the hypothalamic–hypophyseal tract. The hormones are stored in axon terminals and released in the blood when required.