The SAT will never provide blatant false information, especially on a graph like that. It might include some tricky answers like the roman numeral questions usually include, but the test is fairly straightforward in terms of graph analysis. As calcium increases, the need for PTH decreases and this was shown in a downward linear trend. And as you said, PTH increases the levels of calcium in the blood. The question also asked what would happen to blood calcium levels if the PT was removed. The blood calcium would decrease.
The nucleotide mutation was definitely inversion. It was confusing because of a repeating letter, which looks like after a change it returned to the normal sequence, but the repetition was part of the inversion. The sequences looked something like this: http://prntscr.com/7dxbex
@HawaiianHost So you agree with me? It would be pth down, calcium down, body tries to increase calcium for those Qs?
In the beginning
The question about a new trait in an ISOLATED population is mutation and not gene flow because it’s isolated right
@CGlynn I can confirm for the pt removed question but i dont remember any others… But i think you got them right
@Skarlo yes. One of them was genetic drift though right?
@vmiller7723 yeah it was the one in the beginning with gene flow drift mutations etc
@CGlynn I had the same thing for the first two questions but I omitted the third. I left the third blank cuz I was unsure whether the body would find other ways to control levels or E, which said something like the body had no way to regulate.
@Skarlo I know but one of the answers was genetic drift right? I used mutation and genetic drift
@HawaiianHost what happens with removal of pt gland (abt pth), then what happens if pth is not produced, then what happens if calcium levels drop (increase pth not an option)
Two more questions:
- what was the answer about something with the gallbladder? Sensory neurons?
- what do cells that line the gut show?
@vmiller7723 I put motor neurons for the gallbladder one, but that was just a guess… and for the second one I said that they don’t have nuclei. But that was also just a guess
For the first one i got sensory neurons
Edit- what were the choices for the second one
@CGlynn Im not sure what I put but i think youre right
Ok the crab mud/sand one was not substrate (earlier in this thread, everyone seemed to agree that it is). By definition, a substrate is a substance upon which an enzyme reacts. From what I recall, nothing about the question suggested that enzymes were involved.
I think gallbladder one was motor neurons. I thought back to the reflex arc. Sensory neurons detect things that we sense (vision, hearing, pain, etc) and relay the action potential to an interneuron, which connects to a motor neuron and triggers an effector (gland/muscle) to take some action. So the thing actually forcing the gallbladder to release the bile is the motor neuron, even if it may be ultimately caused by something that is sensed.
@Collegewhat But can’t the presence of fat to be emulsified by bile be “sensed” by the gallbladder?
In this context substrate means the type of material, which was mud/sand. Think of it like substance
Ughhhhhh!!! I got the sensory one wrong, I got sensory. What was the mud/sand question though?
Oh, and what was the one about the thyroid gland. It was hypothalamus right?
do you mean the one that asked where the posterior pituitary gland had its hormones synthesized? pretty sure that was hypothalamus. @IequalSmart