NWHSU Embryology Exam 1 Questions Correct Answers Current Update (A+ Pass)
What is the leading cause of infant mortality? - Answers - Birth defects
Can birth defects be prevented? - Answers - You bet your ass they can
What is the most sensitive period of embryonic development when a birth ...
NWHSU Embryology Exam 1
Questions Correct Answers Current
Update (A+ Pass)
What is the leading cause of infant mortality? - Answers -✔✔ Birth defects
Can birth defects be prevented? - Answers -✔✔ You bet your ass they can
What is the most sensitive period of embryonic development when a birth defect can
happen - Answers -✔✔ Embryonic period
During what weeks does the embryonic period take place? - Answers -✔✔ 3-8 weeks
Why is the embryonic period most sensitive? - Answers -✔✔ During this time, the
primordial of each organ system is already formed
What is the leading cause of mental retardation birth defects? - Answers -✔✔ Alcohol
use during pregnancy
Preventing birth defects has to happen prior to conception T or F - Answers -✔✔ T
Embryonic development is directed by ____________ - Answers -✔✔ Genomes
What are genomes? - Answers -✔✔ They contain all of the information required to
make an individual
Information encoded in the DNA are in the form of ____________ - Answers -✔✔
Genes
Approx. how many genes are in the human body? - Answers -✔✔ 23,000
Genes have various levels of regulation T or F - Answers -✔✔ T
At the level of the gene what regulation happens in gene expression - Answers -✔✔
Gene transcription regulation
At the level of RNA transcribed from a gene what regulation happens in gene
expression? - Answers -✔✔ RNA's are regulated if they will reach the cytoplasm and
become messenger RNA's
,At the level of mRNA's what regulation happens in gene expression? - Answers -✔✔
mRNA's may be selectively translated
At the level of proteins made from mRNA's, what regulation happens in gene
expression? - Answers -✔✔ Proteins may be differentially modified
Chromatin is made of __________ and _____________ - Answers -✔✔ Complex of
DNA and histones
If DNA is tightly coiled, what cannot happen? - Answers -✔✔ Transcription
When chromatin appears as beads of nucleosomes on a string of DNA, how is it
referred? - Answers -✔✔ Heterochromatin
When euchromatin is present, DNA can be transscribed T or F - Answers -✔✔ T
The promoter region of a gene binds ____________ for initiation of transcription,
contains the __________ box - Answers -✔✔ RNA polymerase; TATA
_________ that contain DNA sequences will be transcribed and translated into proteins
- Answers -✔✔ Exons
What two sites designate the code for the first amino acid in a protein? - Answers -✔✔
Transcription and translation initiation sites
The 3' untranslated region includes a ________addition site - Answers -✔✔ Poly A
What 3 things does the 3' untranslated region participate in? - Answers -✔✔ -
Stabilizing mRNA
-Allows it to exit the nucleus
-Permits its translation into protein
Where does the RNA polymerase II bind? - Answers -✔✔ Promoter region
In order for RNA polymerase II to bind, the polymerase requires additional proteins
called ____________ - Answers -✔✔ Transcription factors
Transcription factors have a specific ____1______ binding domain and a
______2_______ domain. These ____3____ or ____4____ transcription of the gene
after the binding of its _____5___ or _____6_____ - Answers -✔✔ 1- DNA
2-transactivating
3-activate
4-inhibit
5-promotor
6-enhancer
, Transcription factors active gene expression by causing the __________ complex to
unwind. Also by releasing the __________ so that it can transcribe the DNA template.
Finally, preventing the formation of new ___________ - Answers -✔✔ DNA
nucleosome; polymerase; nucleosomes
In DNA methylation what bases are methylated? - Answers -✔✔ Cytosine
How are some genes silenced? - Answers -✔✔ DNA methylation
DNA methylation represses __________ - Answers -✔✔ Transcription
One methylation mechanism involves inactivation of the ________ chromosome in each
female cell - Answers -✔✔ X
Another methylation mechanism is called genomic imprinting, where only a gene from
the father or mother is ________ and the other gene is _________ - Answers -✔✔
Expressed; silenced
Methylation silences DNA by inhibiting the binding of __________ factors or altering the
_______ binding. - Answers -✔✔ Transcription; histone
The initial transcript of a gene is called ________ - Answers -✔✔ Nuclear RNA (nRNA)
or pre messenger RNA
In alternative splicing, to form different proteins from the same gene it uses _________ -
Answers -✔✔ spliceosomes
_________ recognize specific sites on the initial transcript of nRNA from a gene. -
Answers -✔✔ Spliceosomes
Different proteins derived from the same gene are called the - Answers -✔✔ splicing
isoforms
Differentiation process of a tissue to become a specific structure requires
_____________ - Answers -✔✔ Epithelial-mesenchymal interaction
What signals are sent between tissues in epithelial-mesenchymal interaction - Answers
-✔✔ Inducer and responder
The first tissue in epithelial-mesenchymal interaction constitutes the ________ and the
second constitutes the _________ - Answers -✔✔ Inducer; responder
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Stuviaascorers. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R287,54. You're not tied to anything after your purchase.
