The secret of getting ahead is getting started.

领先他人的秘诀就是行动起来

SATⅡ生物 最新内容

Acids and Bases

2007-10-08 00:00:00

Sometimes atoms give their electrons up altogether instead of sharing them in a chemical bond. This process is known as disassociation....

The Chemistry of Life

2007-10-12 00:00:00

Of the 92 naturally existing elements on the Earth, only 25 play a role in the chemical processes of life. Of these 25, four elements c...

The Molecules of Life

2007-10-12 00:00:00

The elements involved in life processes can, and do, form millions of different compounds. Thankfully, these millions of compounds fall...

Enzymes

2007-10-12 00:00:00

Some chemical reactions simply happen when the two reactants come into contact. For example, you may be familiar with the bubbly “volc...

SATII生物词汇表

2007-11-13 00:00:00

ell and begin to form the spindle.pseudopodsTemporary cytoplasmic protrusions of ameboid cells that function in movement and food uptake by ...

Cell Processes

2007-11-19 00:00:00

Staying alive is no easy business. To keep from dying, cells must constantly juggle a wide range of tasks. They need to turn food into ...

Cell Respiration

2007-11-19 00:00:00

Respiration is the process by which organisms burn food to produce energy. The starting material of cellular respiration is the sugar g...

From DNA to Protein

2007-11-19 00:00:00

DNA directs the cell’s activities by telling it what proteins to make and when. These proteins form structural elements in the cell an...

Protein Synthesis

2007-11-19 00:00:00

Now that we’ve described DNA and RNA, it’s time to take a look at the process of protein synthesis. The synthesis of proteins takes t...

Cell Replication

2007-11-19 00:00:00

Eukaryotic cell replication is a process by which cells duplicate their genetic material and then divide to yield two daughter cells. I...

Mendelian and Molecular Genetics

2007-11-26 00:00:00

The word inheritance usually brings to mind money or property left by a relative who has passed away. But there’s another type of inhe...

Basis of Inheritance: Meiosis

2007-11-26 00:00:00

Mitosis takes a diploid cell and creates a nearly exact copy. Mitosis has two main functions: (1) it leads to the creation of all of th...

Spermatogenesis and Oogenesis

2007-11-26 00:00:00

Meiosis, the process by which gametes are formed, can also be called gametogenesis, literally “creation of gametes.” The specific typ...

Mendel's Experiments

2007-11-26 00:00:00

Gregor Mendel lived in an Austrian monastery and tended the monastery garden. In 1865, through his observations of the garden pea plant...

Modern Explanation of Mendel’s Results

2007-11-26 00:00:00

With our modern understanding of genes, chromosomes, and cellular reproduction, we can explain the biological basis of Mendel’s observ...

Mutations

2007-11-26 00:00:00

Mutations are errors in the genotype that create new alleles and can result in a variety of genetic disorders. In order for a mutation ...

Evolution and Diversity

2007-12-05 00:00:00

The biologist Theodosius Dobszhansky once said, “Nothing in biology makes any sense except in the light of evolution.” Now, old Theod...

Origin of Life: The Heterotroph Hypothesis

2007-12-05 00:00:00

Life on Earth began about 3.5 billion years ago. At that point in the development of the Earth, the atmosphere was very different from ...

Classifying Life

2007-12-05 00:00:00

The diversity of life on Earth is staggering. The science of identifying, describing, naming, and classifying all of these organisms is...

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