Posts tagged BiSci

Other four phases to phase (pun intended) into the game at your own comfort.

Follicular Phase: Shedding of the previous endometrium (menstrual flow) stops, GnRH (gonadotropin releasing hormone) is secreted because of low estrogen and progesterone, thus increasing FSH (follical  stimulating hormone) and LH (luteinizing hormone) secretion.

Ovulation Phase: Estrogen reaches a peak where is produces positive feedback on other hormones making GnRH, FSH, and LH spike. the LH spike induces ovulation (release of ovum from the ovary into the abdominal cavity).

Luteal Phase: follicle ruptures due to high LH levels and forms corpus luteus (secretes estrogen). estrogen and progesterone now do negative feedback on GnRH, FSH, and LH

Menstruation Phase: Assuming no implantation progesterone levels drop off releasing the block on GnRH the cycle then begins again

Rinse… and Repeat…

Good luck

I have come up with a game in my tired state. It may seem stupid but right about now it seems like a great study tool. The game requires you yourself be female or you have a significant other that is a female because this game focuses on sex hormones and the ever important menstrual cycle. 

First memorize the cycle in the simple phases:

1-~10 days is the Proliferative phase. This is where the endometrium is built up to eventually support implantation and fetal development.

~10-~23 days is the Secretory phase. this is where the uterine gland is formed in the endometrium and implantation may occur.

~23-28 days is the Menstrual phase. this is where the endometrium is sloughed off due to no implantation and prepares to try again next month.

Now the game is played like so: ask your female friend previously selected what day of her cycle she is on. now you get to explain what is happening inside her right at that moment. 

Twists: to take it to the next level you can associate and talk about the rise and fall of hormones (estrogen and progesterone) occurring as well. If you are going to take this step be sure and explain fully where estrogen and progesterone are secreted from (most of the time the corpus luteum). Also get her involved and have her ask you questions about what is going on in her body. If she can catch you off guard it will be better for your learning.

WARNING: This may cause unhappy emotions in some people and is meant for fun, learning, and my amusement.

Match the Following event with their corresponding locations:

Event:

1. Glycolysis

2. Pyruvate to Acetyl-CoA

3. Fermentation

4. TCA (Citric Acid)

5. Electron Transpot Chain (ETC)

Location:

A. Mitochondrial Matrix

B. Cytoplasm

C. Inner Mitochondrial Membrane

What you got?

1. Which of the following statements about enzyme kinetics is FALSE?

A. An increase in the substrate concentration leads to proportional increase in the rate of the reaction.

B. Most Enzymes operating in the human body work best at temp of 37 degrees C.

C. An enzyme-substrate complex can either form a product of dissociate back into the enzyme and substrate.

D. Maximal activity of many human enzymes occurs around pH 7.2

2. Some Enzymes require the presence of a non-protein molecule to behave catalytically. An enzyme devoid of this molecule is called a(n).

A. Holoenzyme

B. Apoenzyme

C. Coenzyme

D. Zymoenzyme

Anyone for more?

Good job to those of you that answered F to that last question. If you didn’t get the answer just remember that the cell membrane is comprised of phopholipids that have a hydrophilic (polar) head and a hydrophobic (non-polar)

This one may seem simple to some, be ready i got some more brain busters coming up.

The next question pertains to Enzymes:

By adding more substrate which of these effects are counteracted?

A. Competitive Inhibition

B. Non-Competitive Inhibition

C. All of the Above

What do you think?

Some molecules require help to cross the cellular membrane. depending on the molecule they will require energy, other molecules to help or sometimes nothing. what types of molecules cross through facilitated diffusion?

a. large, polar molecules

b. small, non-polar molecules

c. charged, small molecules/atoms

d. All of the above

e. a and b

f. a and c

what do you think?