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A Karyotype shows the ____ chromosomes sorted and isolated from a cell in ___

46, Metaphase

all of the following participate in DNA replication except

ribosomes.

_____ opens up one segment of the DNA helix during replication, whereas ____ adds complementary free nucleotides to the exposed DNA strand.

DNA Helicase; DNA polymerase

A _____ contains the necessary information for the production of a molecule RNA.

gene

G1, S and G2 phases are collectively called

Interphase

all of the following are directly involved in translation except

DNA

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 polymerase is most active in

S

DNA never migrates from the nucleus to the cytoplasm to participate directly in protein synthesis.

True

Phenotype is the result of genetic influences only

False

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?

25%

DNA replication is called semicoservative because

each daughter DNA consists of one new helix and one old helix

Sister chromatids are pulled to opposite poles of a cell during.

anaphase

A ___ is composed of a granular cluster of eight proteins called ____ with DNA wound around them, plus a short segment of linker DNA

nucleosome; histons

all Proteins made by the ribosomes are exported from a cell for use elsewhere in the body.

false

all of the body's nonreproductive cells, called ___, usually have ____ and are thus called _____ cells.

somatic cells; 23 pairs of chromosomes; diploid

although all cells synthesize phospholipids, there are no genes for phospholipids.

true

the stage at which chromosomes aggregate along the equator of a cell is

metaphase

germ cells have ____ upaired chromosomes and are thus called ___ cells.

23; haploid

naked DNA is called chromatin

false

a cell starting prophase has 92 molecules of DNA in its nucleus.

true

the human genome consists of

about 35,000 genes

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.

Incomplete dominance

_____ are turned on of off by regulatory proteins in accordance with changing needs for the ____ they encode.

Genes; proteins

Copying genetic information from DNA into RNA is called _____, whereas usiing the information contained in mRNA to make a polypeptide is called _____.

transcription; translation

the gene for a poly peptide made of 51 amino acids would have a minimum number of

153 bases.

after translation, a protein may undergo structural changes called ____ modifications.

posttranslational

mitosis is responsible for embryonic development and tissue growth.

true

oncogenes and tumor-suppressor genes have similar effects on cell division

false

a cell finishing mitosis has ___ DNA molecules, while a cell finishing DNA replication has ___ DNA molecules

46; 92

after mitosis each chromosome consists of two parallel filaments called sister chromatids.

false

anticodons, codons, and base triplets correspond to ____, respectively

tRNA, mRNA, and DNA

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

many genes occur in alternative forms called alleles

true

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

recessive

all these are found in the karyotype of a normal human male, except

46 chromatids

Hemophilia is caused by a sex-linked recessive allele. this mean that.

a son who has hemophilia inherited the allele from his mother

All the DNA in one 23-chromosome set is called

Genome

Cytokinesis overlaps with which phase of mitosis?

telophase

which of these is the correct sequence from simpler to more complex?

carbon, nitrogenous base, nucleotide, DNA, chromatin

____ is the DNA base sequence complementary to the strand TGCCAT

ACGGTA

there are three codons that do not code for any amino acid

true

chromatin shortens and thickens, coiling into compact rods during

prophase

DNA is composed of double-ring nitrogenous bases, whereas RNA is composed of single-ring nitrogenous bases.

false

which of the following omits some stage of the cell cycle?

prophase, metaphase, anaphase, telophase, cytokinese

eye color is a normal polygenetic trait.

true

if DNA molecule were known to be 22% thymine, what would be the percentage of guanin?

28%

The enzyme RNA polymerase participates in translation

false

the genetic code is the correspondence between the ___ and the ___ that they represent

mRNA codons; 64 amino acids

a mutation is

a change in DNA structure that might be beneficial, harmful, or neutral

Transcription occures in the ____, but most translation occurs in the ___

nucleus; cytoplasm

Cell division is stimulated by ___ and suppressed by ____

growth factors; contact inhibition

all these can cause a mutation except

a mistake made by the RNA polymearse

the alleles possesed by all members of a population collectively are called the

gene pool

a gene can be defined as an information-containing segment of RNA that codes for the production of a polypeptide.

false

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