10 correct answers If a cell at metaphase of mitosis contains 20 sister chromatids, how many chromosomes will be present in a G1 cell?
a) 5
b) 20
c) 10
K+ correct answers In a resting potential, an example of a cation that is more abundant as a solute in the cytosol of a neuron than it is in ...
BIL 150 EXAM 3 || A+ GRADED
10 correct answers If a cell at metaphase of mitosis contains 20 sister chromatids, how many
chromosomes will be present in a G1 cell?
a) 5
b) 20
c) 10
K+ correct answers In a resting potential, an example of a cation that is more abundant as a
solute in the cytosol of a neuron than it is in the interstitial fluid outside the neuron is
___________.
a) Na+
b) Cl-
c) K+
a plant cell in the process of cytokinesis correct answers Through a microscope, you can see a
cell plate beginning to develop across the middle of a cell and nuclei forming on either side
of the cell plate. This cell is most likely ______________.
a) an animal cell in the process of cytokinesis
b) a plant cell in metaphase of mitosis
c) a plant cell in the process of cytokinesis
an epidemic is restricted to a local region; a pandemic is global correct answers What is the
difference between an epidemic and pandemic?
a) an epidemic is caused by a bacterial infection; a pandemic is caused by a viral infection
b) an epidemic is restricted to a local region; a pandemic is global
c) an epidemic is global; a pandemic is restricted to a local region
in the G2 phase correct answers Students in a biology lab isolated cells in various phases of
the cell cycle. A population of cells that have twice the DNA of G1 phase cells was most
likely isolated from which of the following part of the cell cycle?
a) in the G2 phase
b) immediately after cytokinesis
c) between the G1 and S phase
cAMP correct answers Consider the following pathway:
epinephrine-->G protein-coupled receptor-->G protein-->adenylyl cyclase-->cAMP
Which of the following molecules serves as the second messenger in this pathway?
a) adenylyl cyclase
b) G protein
c) cAMP
DNA that is transcribed into several kinds of small RNAs with biological function correct
answers Much of the human genome does not code for proteins. Which of the following types
of DNA are found in these regions of the genome?
a) DNA that is transcribed into several kinds of small RNAs with biological function
b) DNA that consists only of histone coding sequences
c) DNA that serves as binding sites for reverse transcriptase
, bind to cell-surface receptors and stimulate growth and development of target cells correct
answers Growth-factors are local regulators that _______________
a) bind to cell-surface receptors and stimulate growth and development of target cells
b) are polysaccharides to increased blood sugar concentration
c) are modified fatty acids that stimulate bone and cartilage growth
I, II, III and IV correct answers If a biochemist discovers a ner molecule, which of the
following pieces of data would allow her to draw the conclusion that the molecule is a steroid
hormone?
I) The molecule is lipid-soluble.
II) The molecule is derived from a series of steps beginning with cholesterol.
III) The molecule acts at a target tissue some distance from where it is produced.
IV) The molecule uses a transport protein when in an aqueous solution such as blood.
a) only I, III, and IV
b) only II and III
c) I, II, III, and IV
the host membrane ruptures, releasing many phages correct answers Which of the following
characteristics is typical of the lytic cycle of a bacteriophage?
a) the host membrane ruptures, releasing many phages
b) viral DNA incorporates into the host genome
c) the host sequesters viral particles in the lysosome
the bacterium is unable to donate DNA through conjugation with another cell correct answers
Which of the following statements about the bacteria is most probably accurate?
a) the bacterium is unable to donate DNA through conjugation with another cell
b) the bacterium cannot take up DNA from its external environment
c) the bacterium uses flagella for locomotion
vaccines are inactive versions of a virus that stimulate an immune reaction in a person correct
answers Which of the following statements correctly describes vaccines and how they help
prevent viral infection?
a) vaccines are active versions of a virus that stimulate an immune reaction in a person
b) vaccines are inactive versions of a virus that stimulate an immune reaction in a person
c) vaccines are functional pathogens that stimulate an immune reaction in a person
no action potential results correct answers What happens if twice as many inhibitory
postsynaptic potentials (IPSPs) as excitatory postsynaptic potentials (EPSPs) arrive in odse
proximity at a postsynaptic neuron?
a) a weaker action potential results
b) a stronger action potential results
c) no action potential results
separation of sister chromatids correct answers The mitotic spindle plays a critical role in
which of the following processes?
a) splitting of the cell (cytokinesis) following mitosis
b) separation of sister chromatids
c) dissolving the nuclear membrane
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