bio questions...

[faerielynx]

1) This type of junction is formed when membrane channels of adjacent plasma membranes adhere to each other.



a. tight junction
b. Cell junction
c. Desmosome
d. Gap junction

2) Which of the following is not a characteristic of meiosis?



a. Four haploid gametes
b. A reduction division
c. Two steps of cell division
d. Two haploid gametes


3) The large fluid-filled spaces within the brain are called the:


a. meninges.
b. sulci
c. gyri.
d. ventricles.




4) Both sympathetic and parasympathetic divisions are tonically active, which means they:
a. have opposing effects.
b. continually conduct impulses to autonomic effectors.
c. continually conduct impulses to the brain.
d. are hydrolyzed by the enzyme acetylcholinesterase.

5) The sense organs involved in the sense of balance are found in the vestibule and the:


a. organ of Corti.
b. macula.
c. otoliths.
d. semicircular canals.

6) If we have a hundred moles of amino acids, how many RNA we need?


a. 100 moles
b. 20 moles
c. 10 moles
d. 5 moles
e. 1 mole

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[Katalyst]

1 c
2 d
3 d
4 b
5 d
6 wtf? if the question is to make a 100 aa protein, then e

 

[Jo07]

For the first question, how would you distingish between a desmosome and a gap junction?

Desmosome-for mechanical strength, gap for cellular communication...

 

[noshnosh]

A desmosome, also known as macula adherens or macula adherentes (Latin: adhering spot), is a cell structure specialized for cell-to-cell adhesion.
I think the 1st one is Desmosomes.

 

[REH]

Jo07, I think you're confusing desmosomes with plasmodesmata.

 

[Jo07]

Ah I see..thank you