DAT Biology Actual Test Solved with Complete Verified Answers
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DAT Biology
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DAT Biology
promoter region for mRNA transcription, describe it - TATA sequence (TATA box) help attract
RNA polymerase
In prokaryotes what is needed for the RNA polymerase to bind to the promoter - Sigma factors
Sigma factors bind with RNA Polymerase to form - RNA polymerase holoenzyme and now has
the abil...
DAT Biology Actual Test Solved with
Complete Verified Answers
What happens to malic acid in CAM - ✔✔Stored in vacuole during the night and then
decarboxylated during the day where O2 concentration is low (stomata closed)
Cyclin allosterically activates - ✔✔CDK
CDK (cyclin dependent kinase) - ✔✔The S phase proteins that activates the pre-replication
complexes by phosphorylation.
Signals to the cell that it's able to progress to the next stage
High cyclin= high CDK
Repressor proteins - ✔✔Bind to the promoter to STOP transcription from beginning
The absence of transcription factors - ✔✔DOES NOT stop transcription
They only stimulate the start of gene transcription by attracting RNA to DNA
Up or down regulate transcription
Terminator sequence in DNA - ✔✔Signals end of transcription
Causes RNA poly to disassociate from the DNA
,promoter region for mRNA transcription, describe it - ✔✔TATA sequence (TATA box) help attract
RNA polymerase
In prokaryotes what is needed for the RNA polymerase to bind to the promoter - ✔✔Sigma factors
Sigma factors bind with RNA Polymerase to form - ✔✔RNA polymerase holoenzyme and now has
the ability to target the promoter region of bacterial DNA
In eukaryotes DNA polymerase can not bind directly to the promoter region so it requires -
✔✔Transcription factors
A group of related genes under one promoter is called - ✔✔An operon
The ________ site of DNA regulates by binding to an activator or repressor (transcription factors) -
✔✔Operator
Also upstream the activators can bind to the - ✔✔Enhancers to increase protein transcription
Upstream repressors can bind to - ✔✔Silencers to decrease protein transcription
Do enhancers and silencers have a specific orientation and location? - ✔✔No they are able to
loop around and bind to the activators and repressors
In eukaryotes the terminator sequence has a signal that codes for the stop of transcription called -
✔✔Poly A signal
What does the poly a signal do - ✔✔Stimulates polyadenhlation —-> part of the post transcriptional
modification
,Cleavage furrow uses - ✔✔Microfilaments creating a contractile ring
Fimrae and Cillia are made of - ✔✔Microtubules and can be found in the fallopian tubules and
are inhibited by colchine
In the luteal phase, the ovaries secrete mainly? - ✔✔Progesterone
In the luteal phase, the corpus luteum secretes __ and __ -
✔✔progesterone estrogen
But the end of the female cycle progesterone and estrogen levels are - ✔✔Dropping (negative feed
back loop on hypothalamus and pituitary gland)
The hypothalamus produces what trophic hormone - ✔✔GnRH
What does GnRH release cause - ✔✔Release of LH and FSH from anterior pituitary gland
Where are LH and FSH released from? - ✔✔anterior pituitary
Where are LH and FSH produced? - ✔✔anterior pituitary
What does FSH do in females? - ✔✔Cause ovarian follicles to develop
What follicle produces the most estrogen to release the egg to be ovulated - ✔✔Graafian follicle
Graafian follicle - ✔✔mature follicle that releases a lot of estrogen
What does estrogen do to the endometrium - ✔✔Cause it to thicken
, LH spike due to increase in estrogen causes - ✔✔Ovulation
Ovulation - ✔✔Egg is released from follicle
Release from ovary and travels to Fallopian tube
What happens to the follicle that releases the egg - ✔✔It becomes the corpus luteum
What does the corpus Luteum produce - ✔✔Progesterone
What maintains the corpus luteum - ✔✔LH and FSH levels
Increase in progesterone and estrogen levels cause - ✔✔FSH and LSH levels to drop
Low FSH and LSH causes the corpus luteum - ✔✔To not be maintained this lower progesterone
which stops stimulation of estrogen
If fertilization was to occur what hormone maintains the corpus luteum - ✔✔Human chorionic
gonadotrophin secreted from the placenta thus estrogen and progesterone levels are maintained
Atrioventricular node function - ✔✔brief delay in between the atria contracting and the
contraction of the ventricles
Artioventricular VALVES function - ✔✔prevent back flow of blood from the ventricles into the atria
SA node is the - ✔✔pacemaker of the heart
-depolarization and contraction of the left and right atrium
Where does the AV node send its impulses through - ✔✔bundle of His after delay
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