Beginner
In many cells, the structure that controls the cell's activities is the
Nucleus
At the beginning of cell division, a chromosome consists of two
chromatids
True or False: In the S (or synthesis) phase, new DNA is synthesized when the chromosomes are replicated.
True
During what stage does the chromosomes separate and move apart along spindle fibers to opposite ends of the cell?
anaphase
What are the steps of Mitosis?
Interphase, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis
The rate at which materials enter and leave the cell depends on the cell's
surface area
The period between cell divisions is called
interphase
True or False: In the G2 phase, many of the organelles and molecules required for cell division are produced.
True
During what stage does the chromosomes, which were distinct and condensed, begin to spread out into a tangle of chromatin, two new nuclei form??
telophase
What are the steps of Interphase?
G1, S, G2, M
A substance that moves by passive transport tends to move
away from the area where it is more concentrated.
In the cell cycle, external regulatory proteins direct cells to
speed up or slow down the cell cycle
Humans and other animals regulate cell growth and cell division. In humans, which of these types of cells generally do not divide after they have developed?
muscle cells and nerve cells
Cytokinesis in animal cells occurs through the development of a ____________.
cleavage furrow
Cytokinesis is defined as
the division of the cytoplasm.
The use of scanning electron microscopes allows scientists to view _______________.
A stunning three-dimensional image of the surface of a specimen
The timing in the cell cycle in eukaryotic cells is believed to be controlled by a group of closely related proteins known as
cyclins
In the human body, stem cells in the bone marrow produce a variety of blood cells. What process produces these cells?
Undifferentiated cells divide to produce differentiated cells.
Cytokinesis in plant cells occurs through the development of a ___________.
cell plate
During what stage does the genetic material inside the nucleus condenses and the duplicated chromosomes become visible?? (Also outside the nucleus, a spindle starts to form during this stage.)
prophase
Which substance is broken down during the process of glycolysis?
glucose
If a cell has 12 chromosomes, how many chromosomes will each of its daughter cells have after mitosis and cytokinesis?
12
What is the most likely application of stem cell research?
a treatment for macular degeneration
What happens during the G1 stage in Interphase?
In the G1 phase, cells increase in size and synthesize new proteins and organelles.
During what stage does the centromeres of the duplicated chromosomes line up across the middle of the cell and spindle fibers connect the centromere of each chromosome to the two poles of the spindle??
metaphase