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Quiz von Deana Heitkamp, aktualisiert more than 1 year ago
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Frage 1
Frage
Homologous pairs of chromosomes are
Antworten
-
identical to each other
-
divided in anaphase 2
-
duplicated in prophase 2
-
similar to each other
Frage 2
Frage
The kinetochore contains
Antworten
-
DNA and RNA
-
microtubule phosphatases
-
motor proteins
-
phosphatases
-
protein kinases
Frage 3
Frage
Apoptosis can occur when a cell
Antworten
-
is damaged
-
is no longer needed
-
is too small
-
damaged and not needed
-
all three
Frage 4
Frage
Which of the following is not a second messenger?
Antworten
-
cAMP
-
inositol triphosphate IP3
-
calcium ions
-
diacylgylcerol DAG
-
protein kinase
Frage 5
Frage
A nucleosome is formed by
Antworten
-
the fusion of DNA and proteins
-
the winding of DNA around histone proteins
-
ribosomes and mRNA
-
the fusion of two nucleid
-
the winding of DNA around chromatin
Frage 6
Frage
Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of what stage of mitosis?
Antworten
-
prophase
-
metaphase
-
anaphase
-
telophase
-
cytokinesis
Frage 7
Frage
Separation of sister chromatids is a hallmark of which phase of mitosis?
Antworten
-
prophase
-
metaphase
-
anaphase
-
telophase
-
cytokinesis
Frage 8
Frage
Some plants exhibit alternating generations of haploid and diploid multicellular organisms. The haploid multicellular gametophyte arises from single-cell spores by the process of
Antworten
-
meiosis
-
mitosis
-
spermatogenesis
-
parthenogenesis
-
oogenesis
Frage 9
Frage
A common feature of receptor-mediated signaling is
Antworten
-
amplification
-
autophosphorylation
-
regulation
-
amplification and regulation
-
all three
Frage 10
Frage
A cleavage furrow forms during
Antworten
-
plant cell apoptosis
-
animal cell apoptosis
-
plant cell cytokinesis
-
animal cell cytokinesis
Frage 11
Frage
Synaptic signaling alters membrane potential through which of the following signaling mechanisms?
Antworten
-
G-protein coupled receptors
-
tyrosine kinase receptors
-
ganglioside receptors
-
ligand-gated ioin channels
Frage 12
Frage
Failure of chromosomes to assort independently in meiosis could lead to
Antworten
-
increased crossing over
-
greater or lesser chromosome numbers in gametes
-
smaller chromosomes
-
mutations
-
larger chromosomes
Frage 13
Frage
The cell plate forms during
Antworten
-
animal metaphase
-
plant cytokinesis
-
plant metaphase
-
plant morphogenesis
Frage 14
Frage
Checkpoints in the cell cycle are controlled by
Antworten
-
the concentration of cyclin-dependent kinases
-
the cytoplasmic concentration of cAMP
-
the concentration of cyclins
-
mitotic spindle length
Frage 15
Frage
A liver cell of an organism has 8 chromosomes. How many chromosomes will be in a gamete of that organism?
Antworten
-
2
-
4
-
8
-
16
-
32
Frage 16
Frage
At which stage of meiosis are sister chromatids separated from each other?
Antworten
-
prophase 1
-
prophase 2
-
anaphase 1
-
anaphase 2
Frage 17
Frage
Prokaryotes propagate by
Antworten
-
karyogenesis
-
mitosis
-
cytokinesis
-
oncogenesis
-
binary fission
Frage 18
Frage
A grape vine stem is placed in water with rooting hormone. New growth begins to germinate. What process drives that new growth?
Antworten
-
parthenogenesis
-
gametogenesis
-
meiosis
-
mitosis
-
non-disjunction
Frage 19
Frage
Which of the following chemical signaling systems requires transport in the circulatory system?
Antworten
-
synaptic
-
paracrine
-
endocrine
-
autocrine
Frage 20
Frage
Mitosis results in two _____ cells, while meiosis results in _______ haploid cells.
Antworten
-
diploid/two
-
haploid/four
-
haploid/two
-
diploid/four
Frage 21
Frage
Which of the following is a diploid cell?
Antworten
-
zygote
-
skin cell
-
egg
-
zygote and skin cell
-
all three
Frage 22
Frage
What is a likely evolutionary advantage of sexual reproduction over asexual reproduction?
Antworten
-
produces a greater number of offspring
-
lower chance of using up resources
-
requires fewer steps
-
greater variation in offspring
-
more cost effective
Frage 23
Frage
A drug that prevents translocation of activated receptors from the cytoplasm to the nucleus will affect which signaling system?
Antworten
-
synaptic transmission
-
paracrine signaling
-
steroid hormones
-
gap junction signaling
Frage 24
Frage
Which of the following is common to both meiosis or mitosis?
Antworten
-
parthenogenesis
-
fertilization
-
cytokinesis
-
phosphorylation
-
interphase
Frage 25
Frage
When phosphorylated, cyclin-dependent kinases
Antworten
-
phosphorylate cyclins
-
phosphorylate target proteins
-
dephosphorylate proteins
-
dephosphorylate cyclins
Frage 26
Frage
Activated steroid hormone receptors are also
Antworten
-
calcium channels
-
protein kinases
-
phosphodiesterases
-
protein phosphatases
-
transcription factors
Frage 27
Frage
Tyrosine kinase receptor enzymatic activity is enhanced by
Antworten
-
tyrosine binding to the receptor
-
autophosphorylation
-
G-protein binding
-
GTP
Frage 28
Frage
A haploid dominant organism, such as fungi arise from spores that are
Antworten
-
haploid
-
euploid
-
diploid
-
tetraploid
Frage 29
Frage
Fertilization results in
Antworten
-
a zygote
-
a diploid cell
-
a cell with new genetic cominations
-
none
-
all
Frage 30
Frage
Independent assortment in meiosis occurs during
Antworten
-
interphase
-
metaphase 1
-
cytokinesis
-
prophase 1
Frage 31
Frage
G-proteins are characterized by
Antworten
-
coupling to ganglioside receptors
-
ATPase activity
-
autophosphorylation
-
localization in the cytoplasm
-
a requirement of GTP binding for activation
Frage 32
Frage
When during meiosis are cells haploid?
Antworten
-
after meiosis 1
-
after meiosis 2
-
after interphase
-
after meiosis 1 and 2
-
all three
Frage 33
Frage
G-proteins are composed of
Antworten
-
alpha, beta, and gamma subunits
-
a GTPase and protein kinase A
-
MAP kinases
-
GTP and protein
Frage 34
Frage
Steroid hormone receptors are found in the
Antworten
-
cytoplasm
-
plasma membrane
-
extracellular matrix
-
circulatory system
Frage 35
Frage
Seedless watermelon plants have 33 chromosomes. Why don't their seeds properly develop?
Antworten
-
meiosis cannot evenly reduce chromosome number
-
crossing over cannot occur
-
there is a high mutation rate in these plant cells
-
these cells cannot undergo proper mitosis
Frage 36
Frage
A phospholipase breaks down phospholipids into
Antworten
-
calcium ions and IP3
-
IP3 and cAMP
-
DAG and cAMP
-
calcium ions and cAMP
-
IP3 and DAG
Frage 37
Frage
At the end of the mitotic phase of the cell cycle, each daughter cell has
Antworten
-
the same amount of DNA as at the very beginning of the S phase
-
the same amount of DNA as at the very end of G2
-
half as much DNA as in G1
-
the same amount of DNA as at the very beginning of G2
-
twice as much DNA as in G1
Frage 38
Frage
How are DAG and IP3 formed?
Antworten
-
protein kinase C enzyme activity
-
phosphorylation of cAMP
-
they are hormones that originate from signaling cells
-
phospholipase breakdown of plasma membrane
-
activation of protein kinase A
Frage 39
Frage
G proteins require which of the following for activation
Antworten
-
GTP
-
PKA
-
adenylyl cyclase
-
PKC
-
IP3
Frage 40
Frage
Adenylyl cyclase uses _________ as a substrate to synthesize ________.
Antworten
-
ATP; pyrophosphate
-
AMP; cAMP
-
cAMP; ATP
-
pyrophosphate; cAMP
-
ATP; cAMP
Frage 41
Frage
The haploid number of a human cell is
Antworten
-
12
-
23
-
46
-
92
Frage 42
Frage
Synapses of homologous pairs of chromosomes is required for
Antworten
-
crossing over
-
parthenogensis
-
non-disjunction
-
independent assortment
-
fertilization
Frage 43
Frage
DNA synthesis occurs during which phase of the cell cycle?
Antworten
-
G1 phase
-
G0 phase
-
S phase
-
G2 phase
-
M phase
Frage 44
Frage
Identical copies of chromatin held together at the centromere are called
Antworten
-
sister chromatids
-
histones
-
chromatin
-
nucleosomes
-
homologous chromosomes
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