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WorksheetsTVMSC Biology, chapter 8 review, part 2
Total questions: 39
Worksheet time: 20mins
Most of the cell cycle is taken up by
prophase
metaphase
interphase
mitosis
DNA replication occurs during
interphase
mitosis
prophase
metaphase
The two copies you have of chromosome no. 6 are called
alleles
just chromosome number 6
homologous pair members
a certain gene, say the gene for making keratin
can occur on different chromosomes, like nunber 1 and number 12
is found on the same chromosome, but can be in different positions
is found on the same chromosome, in the same position
In a diploid organism, if there are 7 alleles of a particular gene in the population, what is the maximum number of different alleles an individual may possess?
1
2
3
this is unpredictable without further information
The two copies of chromosome number 8 that you have
could both have come from one of your parents
you got one from mom, the other from dad
Meiosis involves
one cell division
two cell divisions
Abnormal chromosome numbers such as "trisomy 21" (3 copies of number 21) are caused by
nondisjunction during meiosis
any sort of mutation
"nondisjunction" means
a part of a chromosomne gets flipped end-for-end
sister chromatids fail to separate normally during meiosis I or meiosis II
For most chromosomes, receiving the wrong number (too few or too many) is normally
catastrophic, i.e., non-survivable
no big deal
However, receiving the wrong number is often survivable in the case ofr
chromosome number four
chromosome number eleven
chromosome number 17
sex chromosomes, X and Y
An abnormal number of sex chromosomes, when survivable, often leads to a phenotype considered a
mutation
syndrome
diseased state
catastrophe
When are chromosomes all X-shaped?
when they are an X chromosome
prior to DNA replication
after DNA replication but before cell division
A chromosome is X-shaped because it is
an X chromosome
composed of two sister chromatids that have not yet separated
Sister chromatids are
essentially complete chromosomes, which have not yet separated
somewhat different sections of DNA
When are chromosomes all lined up across the equator of a cell?
during interphase
during prophase
during metaphase
during telophase
In a tissue where very little cell division is occurring, most cells would be in
anaphase
interphase or G-zero phase
prophase
metaphase
G-zero phase is a phase of the cell cycle in which
the cell is preparing to divide
the cell is carrying out the function of a mature cell of that type
Most of your somatic (body) cells are in
prophase
metaphase
interphase
G-zero phase
The actual physical division of a cell in two is called
mitosis
meiosis
cell division
cytokinesis
Cytokinesis involves a contractile ring that essentially pinches the cell in two, in
plant cells
animal cells
all cells
In plant cells, cytokinesis occurs by
vesicles of cell wall material joining, depositing a new cell wall
a contractile ring of motor proteins "pinching" the cell in two
either is equally likely
the "mitotic spindle" during cell division is made up of
intermediate filaments
microfilaments
microtubules
A "tetrad" is
any four chromosomes
any four genes
formed when homologous chromosome pair members stick together during mitosis
formed when homologous chromosome pair members stick together during meiosis I
The position of a gene on a chromosome is referred to as its
locus
position
nucleotide number
codon
What does it mean that "seven alleles occur at this locus"?
there are seven alleles of that gene in the population
the individual contains seven alleles of that gene
seven totally different genes can occur at this position
a gene is best defined as
any section of DNA
any fairly long section of DNA
a section of DNA that codes from production of a gene product, usually a protein
Why are your kidney cells different than your nerve cells?
they contain partly different DNA
they contain totally different DNA
partly different genes are expressed in the two cell types
homologous chromosomes are
chromosomes you got from one parent
consecutive chromosomes, like number 1 and number 2
copies of "the same" chromosome, like both are number 3 or number 5
Members of a homologous chromosome pair will contain
the same genes and alleless
different genes and alleles
the same genes but often at least partly different alleles
A gamete will normally contain
one copy of each gene
two copies of each gene
an unpredictable number of copies of each gene
Did Darwin know about the existence of genes?
yes
no
Did Darwin know about the existence of chromosomes?
no
yes
Did Darwin know about the existence of DNA?
yes
no
huh?
you talkin' to me?
A nucleotide is
one of the "letters" of DNA or RNA
a triplet of the "letters" of DNA or RNA
A codon is
three consecutive nucleotides of DNA or RNA
any three nucleotides of DNA or RNA
the "genetic code" refers to
the binding rules, A to T, G to C
the correspondence between mRNA codons and amino acids
the fact that DNA is the hereditary molecule
the table on p. 194 of our text
The match-up between RNA codons and amino acids is carried out by
messenger RNA
transfer RNA
ribosomal RNA
DNA
Which chapter do you think comes next?
Chapter 34--an introduction to ecology
Chaper 16--the origin of microbial life
Chapter 9--cellular ("basic") genetics
Chapter 15--tracing evolutionary history
