課程名稱︰普通生物學乙
課程性質︰系定必修
課程教師︰蔡珊珊+林讚標
開課系所︰農化一
考試時間︰2005/11/21
以下為蔡老師出題部分(70%)
之選擇題部分，佔50%
試題 :
Biology Midtern Exam
I.MATCH THE FOLLOWINGS:(2% each)
1.What are homologous chromosomes?
a.chromosomes that are similar in their size, shape
and gene content
b.similar chromosomes that are found in different
individuals of the same sepcies
c.the two "threads" in a replicated chromosomes
(they have identical copies)
d.the products of the crossing over, which contain a
combination of segments from maternal chromosomes
and segments from paternal chromosomes
2.Phospholipids can form all of the following structures
in water EXCEPT which one?
a.micelles
b.bilayers
c.monolayers
d.vesicles
3.Which of the following is NOT true of osmosis?
a.It is a special case of diffusion.
b.It is an energy-demanding or "active" process.
c.Water moves from areas of high concentration to
areas of low concentration.
d.It occurs whenever solutions are separated by a
semipermeable membrane.
4.What is the most likely role of a cell that contains
an extensive smooth ER?
a.It plays a role in storage.
b.It synthesizes large quantities of lipids.
c.It actively exports protein molecules.
d.It plays a role in immune function.
5.What is the site of synthesis of proteins for export?
a.free ribosomes
b.ribosomes that attach to the endoplasmic reticulum
c.the Gulgi complex
d.ribosomes that are attached to the outer mitochondrial
membrane
6.What is the function of the nuclear pore complex?
a.regulates movement of materials across the nuclear
membrane
b.assembles ribosomes from raw materials that are
synthesized in the nucleus
c.communicates with components of the endomembranal
system
d.synthesizes and repairs DNA, the unit of genetic
information.
7.Transport of materials across a cell membrane:
a.is selective
b.always takes place from a region of greater
concentration to a region of lesser concentration
c.is an energy-requiring process regardless of the
chemical properties of the substance being transported
d.requires a carrier molecule in the membrane
8.A parent cell divides to form two genetically
identical daughter cells in the process of mitosis.
For mitosis to take place:
a.The parent cell must first be fertilized.
b.The parent cell must replicate its entire genome
prior to mitosis.
c.The parent cell must reproduce its DNA during
telophase.
d.The parent cell must divide its DNA in half so each
daughter cell gets only the genes needed to carry
out its functions. In this way, differentiation
occurs.
9.The first gap in the cell cycle(G1) corresponds to:
a.normal growth and functioning
b.the period in which DNA is being replicated
c.the begining of mitosis
d.the stage between DNA replication and the M phase
10.A key difference between mitosis and meiosis is:
a.synapsis of homologous chromosomes in mitosis
b.synapsis of homologous chromosomes in meiosis
c.synapsis of nonhomologous chromosomes in mitosis
d.synapsis of nonhomologous chromosomes in meiosis
11.During interphase of the cell cycle, just prior to
mitosis or meiosis,
a.DNA recombines.
b.Sister chromatids move to opposite poles.
c.The nuclear membrane disappears.
d.DNA content essentially doubles.
12.Genetic variation, provided through sexual
reproduction, offers more opportunity for offspring
to survive in changing environments. What two aspects
of meiosis provide sources of such variation?
a.mutation and fertilization
b.crossing over and allelic exclusion
c.segregation and independent assortment
d.crossing over and independent assortment of chromosomes
13.Mendel crossed yellow-seeded and green-seeded pea
plants and then allowed the offspring to
self-pollinate to produce an F2 generation. The
results were as follows: 6022 yellow and 2001 green
(8023 total). The allele for green seeds has what
relationship to the allele for yellow seeds?
a.dominant
b.incompletely dominant
c.recessive
d.semidominant
14.The alleles found in haploid organisms cannot be
dominant or recessive. Why?
a.Dominance and recessiveness describe interactions
between two alleles of the same gene in the same
individual.
b.Because only one allele is present, alleles in haploid
organisms are always dominant.
c.Alleles in haploid individuals are transmitted like
mitochondrial DNA or chloroplast DNA.
d.Most haploid individuals are bacteria, and bacterial
genetics is completely different from eukaryotic
genetics.
15.According to the structure of DNA, what component of
that structure is most directly associated with
encoding genetic information?
a.the sequence of phosphates
b.nitrogenous bases and their sequence
c.the arrangement of phosphodiester linkages
d.the order of the deoxyribose sugars
e.all of the above are correct
16.What did one-gene-one-enzyme hypothesis state?
a.Genes are composed of stretches of DNA.
b.Genes are made of protein.
c.Genes code for ribozymes.
d.A single gene codes for a single protein.
17.As scientists were attempting to determine the
structure of the genetic code, Crick and co-workers
found that when three base additions or three base
deletions occurred in a single gene, the wild-type
phenotype was sometimes restored.
These data indicated:
a.The code is triplet.
b.The code contains internal punctuation.
c.AUG is the initiating triplet.
d.The code is overlapping.
e.There are three amino acids per base.
18.What is an anticodon?
a.the part of an RNA message that signals the termination
of translation
b.the part of an RNA message that signals the start of
translation
c.the part of a tRNA message that binds to a
complementary codon in mRNA
d.the part of a tRNA that accepts an amino acid, via a
reaction catalyzed by tRNA synthetase
19.The relationship between a gene and a messenger RNA
is as follows:
a.Genes are made from mRNAs.
b.mRNAs are made from genes.
c.mRNAs make proteins which then code for genes.
d.All genes are made from mRNAs.
e.Messenger RNA is directly responsible for making
Okazaki fragments.
20.Which of the following mutations would have the
greatest negative impact on the protein product of a
gene?
a.a base-pair substitution
b.a deletion of three bases near the middle of the gene
c.a single base insertion near the start of the coding
region of the gene
d.a single base deletion close to the end of the coding
region of a gene
21.When considering the general action of RNA polymerases
in eukaryotes, all of the following macromolecules
are transcribed directly from DNA EXCEPT:
a.tRNAs
b.Exons
c.Introns
d.Proteins
e.mRNAs
22.Which component is not directly involved in the
process known as translation?
a.mRNA
b.tRNA
c.ribosomes
d.DNA
e.codon/anticondon
23.Why are the genes involved in lactose metabolism
considered to be an operon?
a.They occupy adjacent loctions on the E.coli chromosomes.
b.They have a similar function.
c.They are all required for the normal cell function.
d.They are under the control of the same promoter.
24.Full induction of the lac operon occurs when:
a.lactose levels are low and glucose levels are low.
b.lactose levels are low and glucose levels are high.
c.lactose levels are high and glucose levels are low.
d.lactose levels are high and glucose levels are high.
25.CAP is said to be responsible for positive regulation
of the lac operon because:
a.CAP binds cAMP.
b.CAP binds the CAP binding site.
c.CAP prevents binding of the repressor to the operator.
d.CAP bound to the CAP binding site increases the
frequency of transcription initiation by RNA polymerase.
e.Extracellular glucose levels influence the ability of
CAP to bind to the CAP binding site.
--
ANS:
acbbb aabab
ddcab dacbc
dddce
※ 編輯: Flaeggon 來自: 218.166.146.133 (12/13 16:33)
※ Jman208:轉錄至看板 NTUAC95 11/05 23:24