Search found 616 matches

by NS_Tutor_Mathias
Tue Apr 21, 2020 9:14 pm
Forum: Post Questions About Exams and QBank
Topic: qbank 1 physics #21
Replies: 1
Views: 1514

Re: qbank 1 physics #21

d = v/t Since velocity is the only vector component of that (unless you know something really, really cool that I don't), displacement ends up giving the same result - the angle between the instantaneous displacement vector and the force acting on it will always be 90 degrees. But we can also take a...
by NS_Tutor_Mathias
Mon Apr 20, 2020 5:34 pm
Forum: Post Questions About Exams and QBank
Topic: FL6 B/B Q18
Replies: 3
Views: 2104

Re: FL6 B/B Q18

The question asks about reverse-transcription PCR amplification (RT-PCR). That means that the procedure will be using RNA and turning it into DNA before amplification. That means the complement to the given coding strand will be our RNA. That in turn means the primer for this process will be identic...
by NS_Tutor_Mathias
Mon Apr 20, 2020 5:24 pm
Forum: Post Questions About Exams and QBank
Topic: bio Qbank3 #45
Replies: 3
Views: 2035

Re: bio Qbank3 #45

Pretty much! Class I transposons can even function without their own reverse transcriptase in the case of SINEs. Not a detail to worry about though. Class II transposons code for transposase, an enzyme that catalyzes their own transposition. This may be worth knowing. And the last point is a little ...
by NS_Tutor_Mathias
Mon Apr 20, 2020 5:06 pm
Forum: Post your questions here about Next Step's MCAT books
Topic: MCAT Physics Chapter 2 Practice Passage
Replies: 5
Views: 3818

Re: MCAT Physics Chapter 2 Practice Passage

Consider the initial center mass: On the horizontal and vertical axes, that is the center of mass of the beam added to the center of mass of the two weights. If you cut the string, the center of mass of the system is now one weight and the center of mass of the beam. So it is just asking you what th...
by NS_Tutor_Mathias
Sat Apr 18, 2020 8:09 pm
Forum: Post Questions About Exams and QBank
Topic: NS FL7 B/B Q50
Replies: 1
Views: 1489

Re: NS FL7 B/B Q50

The author of the question seems to use the word 'frequency' in a way that doesn't very clearly delineate it from the words 'incidence' or 'rate'. In genomics, unfortunately the frequency of mutations doesn't always refer to the intuitive concept of the number of times a site mutates over time, but ...
by NS_Tutor_Mathias
Fri Apr 17, 2020 5:59 pm
Forum: Post Questions About Exams and QBank
Topic: bio Qbank3 #45
Replies: 3
Views: 2035

Re: bio Qbank3 #45

Transposons are just DNA, not any kind of protein. Class I transposons go through a process by which they're first transcribed (to RNA of course) and then reverse-transcribed before being re-inserted into a chromosome. Naturally they have to code for their own reverse transcriptase. Notice how simil...
by NS_Tutor_Mathias
Thu Apr 16, 2020 3:46 am
Forum: Post Questions About Exams and QBank
Topic: NS FL1 PS Q26
Replies: 1
Views: 1331

Re: NS FL1 PS Q26

In option B, the sensation causes the emotion. In option A, the cognitive appraisal causes the emotion. I agree that some of the word choice here ("understand") is potentially misleading, but you can expect this potential level of trickery to happen as answers that allow for direct keyword recogniti...
by NS_Tutor_Mathias
Wed Apr 15, 2020 7:52 pm
Forum: Post Questions About Exams and QBank
Topic: Chem Q Bank 4 #13
Replies: 1
Views: 1383

Re: Chem Q Bank 4 #13

There are a few handy tricks for getting precise log answers, but I usually stick to the following: root 10 = ~3.3 cube root 10 = ~2.2 cube root 100 = ~4.6 Which means log(3.3) = ~ 1/2 log(2.2) = ~1/3 log (5) = ~2/3 Or another way to put it: logs of values of less than 3 should yield less than 0.5 l...
by NS_Tutor_Mathias
Wed Apr 15, 2020 3:08 pm
Forum: Post Questions About Exams and QBank
Topic: bio Qbank 3 #16
Replies: 1
Views: 1425

Re: bio Qbank 3 #16

Archaea have histones.

You don't really have to know this to answer: There is no cellular life without some form of ribosome to synthesize proteins. That is the only answer choice that MUST be present.
by NS_Tutor_Mathias
Wed Apr 15, 2020 3:04 pm
Forum: Post Questions About Exams and QBank
Topic: Qbank3 #10
Replies: 2
Views: 1549

Re: Qbank3 #10

Molecule A is moving by simple diffusion across the plasma membrane: That is why the more of it I have, the faster it transports. You know that this can only be true of non-polar molecules, such as steroid hormones. Molecule B seems to be limited in it's rate of transport. That means it cannot be di...