The first thing any embryo must do before it can develop into an organism is establish early polarity—that is, it must set up a way to distinguish its top from its bottom and its back from its front. ███
Main point ·Developmental mechanisms differ between species early on, but are similar later in development
Passage Style
Single position
Spotlight
23.
According to the passage, polarity ██ ███████████ ██ █ █████ ██████
Question Type
Stated
The author tells us that polarity is established in a human embryo after more stages of cell division than in simple vertebrates such as frogs.
a
after more stages ██ ████ ████████ ████ ██ █████
The author tells us that polarity is established in a human embryo after more stages of cell division than in simple vertebrates such as frogs.
89%
b
before the sperm ██████ ███ ███
The author doesn’t indicate that human polarity is established before fertilization. In fact, since human polarity is established later than frog polarity, and frog polarity is established after fertilization, that implies human polarity is established after sperm enters the egg.
2%
c
after positional information ██ ████████ ██ ███ ███████ ██ ██████████
The author doesn’t discuss p-granules in connection with human polarity.
4%
d
by the same ████████████ █████████ ██ ██ ███ ████████
The author doesn’t indicate similarity between human and nematode polarity development.
3%
e
in the same ███ ██ ██ ███████ ███████████
The author says that human polarity development occurs later than in simpler vertebrates. In addition, we don’t know the mechanism of polarity in humans.
2%
Difficulty
89% of people who answer get this correct
This is a moderately difficult question.
It is similar in difficulty to other questions in this passage.
CURVE
Score of students with a 50% chance of getting this right
25%143
149
75%155
Analysis
Stated
Stated
Stems asking us to identify an idea that appears explicitly in the passage (as opposed to ideas that are merely implied).
Passages that highlight a person, issue, or historical event or development. These passages often focus on why that thing is significant, distinctive, or interesting.
