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ETS major field test in biology
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ETS major field test in biology
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1-132 of 132In contrast to transporters, which of the following statements is true about channel
proteins, like ion channels, in cellular membranes
channel proteins can only mediate passive transport.
channel proteins form pores that are always open
channel proteins interact strongly with the solute(s) that they transport.
channel proteins undergo a conformational change every time they transport a solute
Give this one a try later!
, channel proteins can only mediate passive transport
All of the following statements about plant embryogenesis are correct EXCEPT
Late stages of embryogenesis involve dessication of embryonic tissues
The suspensor is derived from the basal cell
Precursors of all three plant tissue systems are formed during embryogenesis
Cotyledons are derived from the apical cell
Shoot apical meristem formation occurs after seed formation
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Shoo tapical meristem formation occurs after seed formation
The hormone that promotes phototropism in stems is ______
Gibberellin
Cytokinin
Auxin
Ethylene
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Auxin
Mouse sperm contain receptor proteins that bind to a glycoprotein (ZP3) in the zona
pellucida of mouse eggs. Binding of ZP3 receptors to ZP3 initiates the sperm's
acrosomal reaction. All of the following experimental observations would be
expected EXCEPT
Injecting eggs with antibodies that bind to ZP3 blocks in vitro fertilization
Coating synthetic beads with ZP3 leads to sperm aggregation on the beads
,Incubating sperm with purified ZP3 prior to mixing sperm and eggs blocks in vitro
fertilization.
Coating synthetic beads with a different glycoprotein, ZP2, fails to lead to sperm
aggregation on the beads-
Incubating eggs with antibodies that bind to ZP3 blocks in vitro fertilization
Give this one a try later!
Injecting eggs with antibodies that bind to ZP3 blocks in vitro fertilization
In garden peas, the allele for tall plants (D) is completely dominant to the allele for
dwarf plants (d) and the allele for violet flower color (W) is completely dominant to
the allele for white flower color (w). In a cross between a tall violet plant, with the
genotype DDWw, and a dwarf white plant, what phenotypic ratio of the progeny
would be expected from this cross?
Answers:
All tall violet
1 tall violet: 1 tall white: 1 dwarf violet: 1 dwarf white
1 tall violet: 1 tall white
1 tall violet: 1 dwarf violet
All dwarf white
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1 tall violet: 1 tall white
In the formation of the earliest cells, which of the following components most likely
arose first?
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, Plasma membrane
A previously know organism that lacks a nuclear membrane and mitochondria has just
been discovered. Which of the following would this organism most likely possess?
Endoplasmic reticulum****
Ribosomes
Chloroplasts ***
Cilia*
Lysosome **
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Ribosomes
An organism with a lobed thallus, rhizoids, and gemmae is a
Fern
Filamentous mold
Moss
Mushroom
Liverwort
Give this one a try later!
Liverwort
Up-regulation of glucose transporters at the plasma membrane occurs through the
process of ____
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