Which of the following must occur before cell division begins?

a. duplication of the nucleus
b. DNA replication
c. cytokinesis
d. DNA segregation


Answer: b. DNA replication

Biology & Microbiology

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Along with a significant genetic component, ____________________ plays a significant role in the development of spina bifida

Fill in the blank(s) with correct word

Biology & Microbiology

What role does the plant cell wall compound lignin play in the adaptation of plants to a land environment?

What will be an ideal response?

Biology & Microbiology

Life-threatening aneurisms are most likely to occur in

A) veins. B) venules. C) capillaries. D) arterioles. E) arteries.

Biology & Microbiology

What term is used to indicate the ability of a cancer to invade other parts of the body and to produce secondary tumors?

a. Angiogenesis b. Metastasis c. Carcinogenesis d. all of the above

Biology & Microbiology