MCAT Biology Question — Relevant Connection
- Oct 24, 2014
- MCAT Question of the Day
Which of the following correctly indicates the order and relevant connection between the listed terms:
I. Zygote → Blastula → Gastrula
II. Morula → Inner Cell Mass → Placenta
III. Gastrula → Ectoderm → Neural Tissue
A) I only
B) I and II only
C) I and III only
D) II and III only
When the embro begins forming, it passes through four general stages: Zygote, Morula, Blastula, Gastrula. Thus (I) gets the order of the listed terms correct (although it skips the morula stage). After the gastrula develops, organogenesis follows. In that process, organ systems develop from the three primary germ layers: endoderm, mesoderm, ectoderm. The ectoderm gives rise to epidermis and the tissues of the nervous system. Thus (III) indicates the correct connections.
(II) is false because it lists the placenta coming from the inner cell mass. The inner cell mass develops into the embryo. It is the trophoblasts surrounding the inner cell mass that become the placenta.
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Search the Blog
Interested in our Online MCAT Course, One-on-One MCAT Tutoring or Med admissions packages? Set up a free consultation with one of our experienced Senior Student Advisors.Schedule Now
MCAT Blog What's on the MCAT?
MCAT Blog How to Review MCAT Full Lengths
Free MCAT Practice AccountNeed great MCAT practice?
Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.Learn More