Science 7

Created by AnnaAnnoula98 

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What is interphase?

The cell grows to its mature size, makes a copy of its DNA, and prepares to divide into two cells. Two cylindrical structures called centrioles are also copied.

What is mitosis?

The stage during which the cells nucleus divides into two new nuclei.

What are the four parts of mitosis? Explain.

-Prophase, Chromatin in the nucleus condenses to form chromosomes. The pairs of centrioles move to opposite sides of the nucleus. Spindle fibers form a bridge between the ends of the cell. The nuclear envelope breaks down.
-Metaphase, The chromosomes line up across e center of the cell. Each chromosome attaches to a spindle fiber at its centromere.
-Anaphase, The centromere split. The two chromatids separate, and each chromatid becomes a new chromosome. The new chromosomes move to opposite ends of the cell. The cell stretches out as the opposite ends are pushed apart.
-Telophase, The chromosomes begin to stretch out and lose their rodlike appearance. A new nuclear envelope forms around each region of chromosomes.

What is cytokinesis?

The cell membrane pinches in around the middle of the cell. The cell splits in two. Each daughter cell ends up with an identicle set of chromosomes and about half the organelles.

What part of the cell seems to tell a cell to stop undergoing mitosis?

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What type of reproduction is mitosis?

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What are the chromosomes made of?

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What is diffusion?

The method by which small molecules move across the cell membrane. The process by which molecules move from an area of high concentration to an area of lower concentration.

What is osmosis?

The diffusion of water molecules through a selectively permeable membrane.

What are the two types of active transport? Explain.

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Whar are the 3 kinds of osmotic solutions?

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What is passive transport?

The movement of dissolved materials through a cell membrane without using cellular energy.

What is active transport?

The movement of materials through a cell membrane using cellular energy.

If there are no visible chromosomes, what phase would you be in the life cycle of the cell?

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Why do cells undergo mitosis?

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What is the chromatid?

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What is a chromosome?

A double rod of condensed chromatin.

What is the difference between chromatid and chromosomes?

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What is a sister chromatid?

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What are spindle fibers?

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What is the centromere used for?

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Why can cells only reach a certain size?

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What is ATP?

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What is a transport protein?

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What is DNA made up of?

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What are the four nitrogen bases? How do they pair?

Adenine, thymine, guanine, and cytosine.
Adenine and thymine, guanine and cytosine.

How large is the human genome?

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How many pairs of human chromosomes are there?

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What is a triplet codon?

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What is taxonomy?

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Whatis classification?

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Who was the first to classify and what system did he use?

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Who devised a system using morphology? Explain.

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Why is classification used in biology? Give 2 reasons.

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Each level of classification is called. and they are...

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What is a phylum? What is an order?

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What four traits are used to determine which kingdom an organism is in?

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What are the other names for autotroph and heterotroph?

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Explain Hor bionomial nomenclature is used?

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What is the most numerous form of life on the earth?

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What species of the genus Homo came befor sapiens?

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What phylum is Homo sapiens in?

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