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Components and Structure

A cell’s plasma membrane defines the cell, outlines its borders, and determines the nature of its interaction with its environment (see [link] for a summary). Cells exclude some substances, take in others, and excrete still others, all in controlled ...

Tác giả: Trần Bảo Ngọc viết 15:35 ngày 25/05/2018 chỉnh sửa

Research Methods

Sociologists examine the world, see a problem or interesting pattern, and set out to study it. They use research methods to design a study—perhaps a detailed, systematic, scientific method for conducting research and obtaining data, or perhaps an ...

Tác giả: Trần Bảo Ngọc viết 15:35 ngày 25/05/2018 chỉnh sửa

Thermal Expansion of Solids and Liquids

Thermal expansion joints like these in the Auckland Harbour Bridge in New Zealand allow bridges to change length without buckling. (credit: Ingolfson, Wikimedia Commons) The expansion of alcohol in a thermometer is one of many commonly encountered ...

Tác giả: Trần Bảo Ngọc viết 15:35 ngày 25/05/2018 chỉnh sửa

The Process of Meiosis

Sexual reproduction requires fertilization , the union of two cells from two individual organisms. If those two cells each contain one set of chromosomes, then the resulting cell contains two sets of chromosomes. Haploid cells contain one set of chromosomes. ...

Tác giả: Trần Bảo Ngọc viết 15:35 ngày 25/05/2018 chỉnh sửa

Reproductive Development and Structure

Sexual reproduction takes place with slight variations in different groups of plants. Plants have two distinct stages in their lifecycle: the gametophyte stage and the sporophyte stage. The haploid gametophyte produces the male and female gametes by mitosis ...

Tác giả: Trần Bảo Ngọc viết 15:34 ngày 25/05/2018 chỉnh sửa

Fractures: Bone Repair

A fracture is a broken bone. It will heal whether or not a physician resets it in its anatomical position. If the bone is not reset correctly, the healing process will keep the bone in its deformed position. When a broken bone is manipulated and set into ...

Tác giả: Trần Bảo Ngọc viết 15:34 ngày 25/05/2018 chỉnh sửa

RLC Series AC Circuits

When alone in an AC circuit, inductors, capacitors, and resistors all impede current. How do they behave when all three occur together? Interestingly, their individual resistances in ohms do not simply add. Because inductors and capacitors behave in ...

Tác giả: Trần Bảo Ngọc viết 15:34 ngày 25/05/2018 chỉnh sửa

Autonomic Reflexes and Homeostasis

The autonomic nervous system regulates organ systems through circuits that resemble the reflexes described in the somatic nervous system. The main difference between the somatic and autonomic systems is in what target tissues are effectors. Somatic responses ...

Tác giả: Trần Bảo Ngọc viết 15:33 ngày 25/05/2018 chỉnh sửa

Signaling Molecules and Cellular Receptors

There are two kinds of communication in the world of living cells. Communication between cells is called intercellular signaling , and communication within a cell is called intracellular signaling . An easy way to remember the distinction is by understanding ...

Tác giả: Trần Bảo Ngọc viết 15:33 ngày 25/05/2018 chỉnh sửa

Coulomb’s Law

This NASA image of Arp 87 shows the result of a strong gravitational attraction between two galaxies. In contrast, at the subatomic level, the electrostatic attraction between two objects, such ...

Tác giả: Trần Bảo Ngọc viết 15:33 ngày 25/05/2018 chỉnh sửa

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Components and Structure

Research Methods

Thermal Expansion of Solids and Liquids

The Process of Meiosis

Reproductive Development and Structure

Fractures: Bone Repair

RLC Series AC Circuits

Autonomic Reflexes and Homeostasis

Signaling Molecules and Cellular Receptors

Coulomb’s Law

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