Bio Questions

Hi, I was doing some practice problems and I have problems with these questions. I don't know if my answers are any right. Can anyone please help me verify it? Thanks a lot...

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) The three divisions of the brain that make up the brainstem are the:
a. medulla oblongata, thalamus, and pons.
b. medulla oblongata, thalamus, and midbrain.
c. medulla oblongata, midbrain, and pons.
d. medulla oblongata, pons, and cerebellum.

5) 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.

6) 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.