18036971
Descripción
Test por Deana Heitkamp, actualizado hace más de 1 año
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Creado por Deana Heitkamp
hace más de 5 años
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|
Pregunta 1
Pregunta
Homologous pairs of chromosomes are
Respuesta
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identical to each other
-
divided in anaphase 2
-
duplicated in prophase 2
-
similar to each other
Pregunta 2
Pregunta
The kinetochore contains
Respuesta
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DNA and RNA
-
microtubule phosphatases
-
motor proteins
-
phosphatases
-
protein kinases
Pregunta 3
Pregunta
Apoptosis can occur when a cell
Respuesta
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is damaged
-
is no longer needed
-
is too small
-
damaged and not needed
-
all three
Pregunta 4
Pregunta
Which of the following is not a second messenger?
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cAMP
-
inositol triphosphate IP3
-
calcium ions
-
diacylgylcerol DAG
-
protein kinase
Pregunta 5
Pregunta
A nucleosome is formed by
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the fusion of DNA and proteins
-
the winding of DNA around histone proteins
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ribosomes and mRNA
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the fusion of two nucleid
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the winding of DNA around chromatin
Pregunta 6
Pregunta
Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of what stage of mitosis?
Respuesta
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prophase
-
metaphase
-
anaphase
-
telophase
-
cytokinesis
Pregunta 7
Pregunta
Separation of sister chromatids is a hallmark of which phase of mitosis?
Respuesta
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prophase
-
metaphase
-
anaphase
-
telophase
-
cytokinesis
Pregunta 8
Pregunta
Some plants exhibit alternating generations of haploid and diploid multicellular organisms. The haploid multicellular gametophyte arises from single-cell spores by the process of
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meiosis
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mitosis
-
spermatogenesis
-
parthenogenesis
-
oogenesis
Pregunta 9
Pregunta
A common feature of receptor-mediated signaling is
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amplification
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autophosphorylation
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regulation
-
amplification and regulation
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all three
Pregunta 10
Pregunta
A cleavage furrow forms during
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plant cell apoptosis
-
animal cell apoptosis
-
plant cell cytokinesis
-
animal cell cytokinesis
Pregunta 11
Pregunta
Synaptic signaling alters membrane potential through which of the following signaling mechanisms?
Respuesta
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G-protein coupled receptors
-
tyrosine kinase receptors
-
ganglioside receptors
-
ligand-gated ioin channels
Pregunta 12
Pregunta
Failure of chromosomes to assort independently in meiosis could lead to
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increased crossing over
-
greater or lesser chromosome numbers in gametes
-
smaller chromosomes
-
mutations
-
larger chromosomes
Pregunta 13
Pregunta
The cell plate forms during
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animal metaphase
-
plant cytokinesis
-
plant metaphase
-
plant morphogenesis
Pregunta 14
Pregunta
Checkpoints in the cell cycle are controlled by
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the concentration of cyclin-dependent kinases
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the cytoplasmic concentration of cAMP
-
the concentration of cyclins
-
mitotic spindle length
Pregunta 15
Pregunta
A liver cell of an organism has 8 chromosomes. How many chromosomes will be in a gamete of that organism?
Respuesta
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2
-
4
-
8
-
16
-
32
Pregunta 16
Pregunta
At which stage of meiosis are sister chromatids separated from each other?
Respuesta
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prophase 1
-
prophase 2
-
anaphase 1
-
anaphase 2
Pregunta 17
Pregunta
Prokaryotes propagate by
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karyogenesis
-
mitosis
-
cytokinesis
-
oncogenesis
-
binary fission
Pregunta 18
Pregunta
A grape vine stem is placed in water with rooting hormone. New growth begins to germinate. What process drives that new growth?
Respuesta
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parthenogenesis
-
gametogenesis
-
meiosis
-
mitosis
-
non-disjunction
Pregunta 19
Pregunta
Which of the following chemical signaling systems requires transport in the circulatory system?
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synaptic
-
paracrine
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endocrine
-
autocrine
Pregunta 20
Pregunta
Mitosis results in two _____ cells, while meiosis results in _______ haploid cells.
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diploid/two
-
haploid/four
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haploid/two
-
diploid/four
Pregunta 21
Pregunta
Which of the following is a diploid cell?
Respuesta
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zygote
-
skin cell
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egg
-
zygote and skin cell
-
all three
Pregunta 22
Pregunta
What is a likely evolutionary advantage of sexual reproduction over asexual reproduction?
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produces a greater number of offspring
-
lower chance of using up resources
-
requires fewer steps
-
greater variation in offspring
-
more cost effective
Pregunta 23
Pregunta
A drug that prevents translocation of activated receptors from the cytoplasm to the nucleus will affect which signaling system?
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synaptic transmission
-
paracrine signaling
-
steroid hormones
-
gap junction signaling
Pregunta 24
Pregunta
Which of the following is common to both meiosis or mitosis?
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parthenogenesis
-
fertilization
-
cytokinesis
-
phosphorylation
-
interphase
Pregunta 25
Pregunta
When phosphorylated, cyclin-dependent kinases
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phosphorylate cyclins
-
phosphorylate target proteins
-
dephosphorylate proteins
-
dephosphorylate cyclins
Pregunta 26
Pregunta
Activated steroid hormone receptors are also
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calcium channels
-
protein kinases
-
phosphodiesterases
-
protein phosphatases
-
transcription factors
Pregunta 27
Pregunta
Tyrosine kinase receptor enzymatic activity is enhanced by
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tyrosine binding to the receptor
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autophosphorylation
-
G-protein binding
-
GTP
Pregunta 28
Pregunta
A haploid dominant organism, such as fungi arise from spores that are
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haploid
-
euploid
-
diploid
-
tetraploid
Pregunta 29
Pregunta
Fertilization results in
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a zygote
-
a diploid cell
-
a cell with new genetic cominations
-
none
-
all
Pregunta 30
Pregunta
Independent assortment in meiosis occurs during
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interphase
-
metaphase 1
-
cytokinesis
-
prophase 1
Pregunta 31
Pregunta
G-proteins are characterized by
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coupling to ganglioside receptors
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ATPase activity
-
autophosphorylation
-
localization in the cytoplasm
-
a requirement of GTP binding for activation
Pregunta 32
Pregunta
When during meiosis are cells haploid?
Respuesta
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after meiosis 1
-
after meiosis 2
-
after interphase
-
after meiosis 1 and 2
-
all three
Pregunta 33
Pregunta
G-proteins are composed of
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alpha, beta, and gamma subunits
-
a GTPase and protein kinase A
-
MAP kinases
-
GTP and protein
Pregunta 34
Pregunta
Steroid hormone receptors are found in the
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cytoplasm
-
plasma membrane
-
extracellular matrix
-
circulatory system
Pregunta 35
Pregunta
Seedless watermelon plants have 33 chromosomes. Why don't their seeds properly develop?
Respuesta
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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
Pregunta 36
Pregunta
A phospholipase breaks down phospholipids into
Respuesta
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calcium ions and IP3
-
IP3 and cAMP
-
DAG and cAMP
-
calcium ions and cAMP
-
IP3 and DAG
Pregunta 37
Pregunta
At the end of the mitotic phase of the cell cycle, each daughter cell has
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the same amount of DNA as at the very beginning of the S phase
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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
Pregunta 38
Pregunta
How are DAG and IP3 formed?
Respuesta
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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
Pregunta 39
Pregunta
G proteins require which of the following for activation
Respuesta
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GTP
-
PKA
-
adenylyl cyclase
-
PKC
-
IP3
Pregunta 40
Pregunta
Adenylyl cyclase uses _________ as a substrate to synthesize ________.
Respuesta
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ATP; pyrophosphate
-
AMP; cAMP
-
cAMP; ATP
-
pyrophosphate; cAMP
-
ATP; cAMP
Pregunta 41
Pregunta
The haploid number of a human cell is
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12
-
23
-
46
-
92
Pregunta 42
Pregunta
Synapses of homologous pairs of chromosomes is required for
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crossing over
-
parthenogensis
-
non-disjunction
-
independent assortment
-
fertilization
Pregunta 43
Pregunta
DNA synthesis occurs during which phase of the cell cycle?
Respuesta
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G1 phase
-
G0 phase
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S phase
-
G2 phase
-
M phase
Pregunta 44
Pregunta
Identical copies of chromatin held together at the centromere are called
Respuesta
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sister chromatids
-
histones
-
chromatin
-
nucleosomes
-
homologous chromosomes
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