chapter 6
organims that have two identical alleles for a particular triat are said to be
homozygous
proteins
when cells are grown in a laboratory, which of the following is a factor that can STOPS normal cells from dividing?
contact with other cells
the DNA that makes up an organisms genes must be capable of storing, copying, and CHANGING information
transmitting
who is credited with the invention of the microscope?
anton van leeuwenhock
gregor mendel's principles of genetics apply to
all organisms
which of the following are found in both DNA and RNA
phospahte groups, guanine, and cytosine
which event occurs during interphase?
organelles duplicate
watson and crick discovered that covalent bonds hold base pairs together at the center of a strand of DNA
false, hydrogen
unlike the cell membrane, the cell wall is
a strong, rigid structure
RNA contains
uracil
the process which one cell divides into two cells is called
the cell cycle
are weak bonds that hold the two strands of DNA together but also allow DNA to separate and replicate
hydrogen bonds
which organelle breaks down materials needed for the cell?
lysosome
gametes have
one allele for each gene
which type of RNA copies the information in genetic code from the nucleus to other parts of the cell
mRNA
cancer is a disorder in which some cells have lost the ability to control their size
response to cyclins
what happens when a piece of DNA is missing?
genetic information is lost
what is NOT found in the the nucleus?
mitochodria
situations in which one allele for a gene is not completely dominant over another allele for that gene are called
incomplete dominace
a promoter is
specific sequence of nucleotides that serve as binding site for RNA polymerse to start marking mRNA
compared to small cells, large cells have more trouble
moving needed materials in and waste products out
which two bases pair together in DNA?
cytosine and guanie
which means of particle transport requires an input of energy from the cell?
active transport