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ap biology 9.2
questions
29
Biology
11th Grade
09/26/2011

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Term
The DNA in the chromosomes of eukaryotes is associated with various proteins, uncluding _____that are especially involved in organizing chromosomes.
Definition
histone proetins
Term
When a eukaryotic cell is not undergoing division, the DNA within a nucleus is a tangled mass of thin threads called _____.
Definition
chromatin
Term
What happens to chromatin before mitosis begins? What is easy to see?
Definition
it becomes highly coiled and condensed, and it is is easy to see the individual chromosomes
Term
How many chromosomes do human cells contain? corn? goldfish?
Definition
46; 20; 94
Term
What does the diploid number include?
Definition
two chromosomes of each kind
Term
Half the diploid number, called the ______contains only one chromsome of each kind.
Definition
haploid number
Term
The dividing cell is called the_____and he resulting cells are called the ______.
Definition
parent cell; daughter cells
Term
Before nunclear division takes place, the DNA replicates, ______.
Definition
duplicating the chromosomes in the parent cell
Term
Sister chromatids are cinstricted and attached to each other at a region called the_____.
Definition
centromere
Term
Protein complexes called _____develop on either side of the centromere during cell divison.
Definition
kinetochores
Term
What are the seven phases of the cell?
Definition
interphase, prophase, prometophase, metaphase, anaphase, telephase, and cytokinesis
Term
What happens during interphase?
Definition
the cell grows
Term
During prophase, the chromosomes _____and become_____. _____dissolve the membrane to separarate the chromatids. And ____move to opposite sides of the cell.
Definition
coil up and become visible; nuclear enzymes; centrisomes
Term
What happens during prometophase?
Definition
the spindle fibers attach to centromere tot he kinetochore
Term
During metaphase,_____move to the line up in the middle.
Definition
chromsomes
Term
What happens during anaphase?
Definition
the chromosomes separate and the centromere move to opposite sides
Term
During telephase, chromsomes arraive at opposite sides and the the spindle fibers disappear and a _____reforms around the chromosomes on opposite sides and the chromosomes _____.
Definition
nucleus; uncoil
Term
An imaginary plane that is perpendicular and passes through this circle is called the _____.
Definition
metaphase plate
Term
what is the result when mitosis occurs but cytokinesis doesn't occur?
Definition
a multinucleated cell forms
Term
What is the name for the division of the cytoplasm?
Definition
cytokinesis
Term
Where does cytokinesis begin and continue into? When does it reach completion?
Definition
begins in anaphase and continues in telophase; does not reach completion until the following interphase begins
Term
In animal cells, a ____which is an inentation of the membrane between the two duaghter nuclei begins as anaphase draws close.
Definition
cleavage furrow
Term
the cleavage furrow deepens when a band of actin filaments, called the _____, slowly forms a circular constriction between the two duaghter cells.
Definition
contractile ring
Term
What does cytokinesis involve that does not occur in animal cells?
Definition
the building of a new cell wall between the daughter cells
Term
The _____is simply newly formed plasma membrane that expands outward until it reaches the old plasma membrane and fuses with this membrane.
Definition
cell plate
Term
____permits growth and repair.
Definition
mitosis
Term
Cytokinesis in animal cells is accomplished by a _____.
Definition
furrowing process
Term
in flowering plants, ______retains the ability to divide throughout the life of a plant.
Definition
meristematic
Term
What are the two types of cloning?
Definition
therapeutic and reproductive
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