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_____ opens up one segment of the DNA helix during replication, whereas ____ adds complementary free nucleotides to the exposed DNA strand.
DNA Helicase; DNA polymerase
Since there are no genes coding for carbohydrates, nucleic acids, or lipids, how do cells produce them?
Enzymes encoded by genes synthesize these products.
DNA never migrates from the nucleus to the cytoplasm to participate directly in protein synthesis.
The allele for cleft chin (C) is dominant to the allele for uncleft chin (c). A male and female who are both heterozygous for cleft chin have a child. what is the chance that this child will have an uncleft chin?
DNA replication is called semicoservative because
each daughter DNA consists of one new helix and one old helix
A ___ is composed of a granular cluster of eight proteins called ____ with DNA wound around them, plus a short segment of linker DNA
all of the body's nonreproductive cells, called ___, usually have ____ and are thus called _____ cells.
somatic cells; 23 pairs of chromosomes; diploid
in familial hypercholesterolemia, individuals with two abnormal alleles die of heart attacks in childhood, those with only one abnormal allele typically die as young adults, and those with two normal alleles have normal life expectancies. this exemplifies.
_____ are turned on of off by regulatory proteins in accordance with changing needs for the ____ they encode.
Copying genetic information from DNA into RNA is called _____, whereas usiing the information contained in mRNA to make a polypeptide is called _____.
after translation, a protein may undergo structural changes called ____ modifications.
a cell finishing mitosis has ___ DNA molecules, while a cell finishing DNA replication has ___ DNA molecules
You were able to radioactively tag and thereby trace an amino acid that is used to make insulin, a hormone that will be exported out of the cell. The pathway of the tagged amino acid would be
rough ER ---> golgi complex ---> golgi vesicle --> extracellular fluid.
DNA is a polymer of ____, which consists of a sugar, a phosphate group, and a ____
nucleotides; nitrogenous base
which of these processes occurs during a cell's first gap (g1) phase?
The cell synthesizes proteins and grows.
if one allele is not phenotypically expressed in the presence of another, we say that it is a ___ allele
Hemophilia is caused by a sex-linked recessive allele. this mean that.
a son who has hemophilia inherited the allele from his mother
which of these is the correct sequence from simpler to more complex?
carbon, nitrogenous base, nucleotide, DNA, chromatin
DNA is composed of double-ring nitrogenous bases, whereas RNA is composed of single-ring nitrogenous bases.
which of the following omits some stage of the cell cycle?
prophase, metaphase, anaphase, telophase, cytokinese
the genetic code is the correspondence between the ___ and the ___ that they represent
mRNA codons; 64 amino acids
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