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