4 easy problems in 7th grade science?
6) When molecules move through a membrane from a region of low concentration to a region of high concentration, the process is called
a. diffusion
b. passive transport
c. active transprot
d. fermentation
# 9) before the energy in food can be used by a cell, it must first be transferred to mileciles of
a. proteins
b carbohidrates
c dna
d atp
# 10) Which of the following doesnt perform mitosos?
a prokaryotic cell
b human body cell
c eukaryotic cell
d plant cell
12) How many chromatids are present in a chromosome at the beginning of mitosis?
13) Describe the 3 stages of the cell cycle on a eukaryotic cell.
THXX!!!
One Response
ravenfeatherz
09 Mar 2010
6 a #9 d # 10 c #12 two #13 First stage – The cell grows and copies its organelles and chromosomes. During this time, the strands of DNA and proteins are like loosely coiled pieces of thread. After each chromosome is duplicated, the two copies are called chromatids. Chromatids are held together at a region called the centromere. The chromatids each twist and coil and condense into an X shape. After this happens, the cell enters the second stage of the cell cycle.
Second Stage – The chromatids separate. The complicated process of chromosone is separation is mitosis. Mitosis ensures that each new cell receives a copy of each chromosomes. Mitosis can be divided into four phases.
Third Stage – The cell divides and produces two cells that are identical to the original cell. Cell division will be discussed after mitosis has been described.