1. Cell organelles involved in synthesis of protein hormones are —————— .
a. Smooth endoplasmic reticulum
b. Mitochondria
c. Golgi bodies
d. None of above
2. Cholesterol side chain cleavage reaction in the biosynthesis of steroid hormones occurs in——————–.
a. Mitochondria
b. Endoplasmic reticulum
c. Golgi bodies
d. Secretory granules
3. The hypothalamic magnocellular neurosecretary system secretes oxytoxin and vasopressin from the ……… ………..
a. Anterior pituitary
b. Posterior pituitary
c. Secondary plexus
d. Median eminence
Feedback: Secretion from magnocellular neurosecretory cells. Secretion of oxytocin and vasopressin from axon swellings and terminals in the posterior pituitary gland occurs by exocytosis of dense-core vesicles in response to action potential invasion of the neurosecretory membrane.
4. The regular periodicity of spermatogonia initiation is called——————–
a. Spermatogenesis
b. Spermatogenic wave
c. Spermatogenic cycle
d. None of the above
5. A plant, bacterial or fungal cell that had its cell wall partially removed using either mechanical or enzymatic means is called———————–.
a. Phragmoplast
b. Mitoplast
c. Protoplast
d. Both b & c
6. Terrestrial reptiles are———————–animals.
a. Ammoniotelic
b. Ureotelic
c. Uricotelic
d. Horotelic
7. ————– an essential amino acid and must be provided in diet.
a. Alanine
b. Glutamate
c. Serine
d. Methionine
Feedback: Essential amino acids cannot be made by the body. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
8. A strong acid has——————–
a. Low pKa
b. Low pH
c. Both a & b
d. High pKa
Feedback: Strong acids have a small logarithmic constant (pKa) and a large acid dissociation constant (Ka). Most strong acids are corrosive, but some of the superacids are not. In contrast, some of the weak acids (e.g., hydrofluoric acid) can be highly corrosive. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution.
9. ———————-is an extracellular layer surrounding the egg cell membrane and is often used in sperm recognition.
a. Fertilization envelope
b. Zona pellucida
c. Vitelline envelope
d. Both b & c
Feedback: Surrounding the egg plasma membrane is an extracellular layer often used in sperm recognition. In most animals, this extracellular layer is the vitelline envelope. In mammals, it is the much thicker zona pellucida.
10. Bony fishes have a heart with ——— chambers.
a. One
b. two
c. four
d. Five
Feedback: A bony fish’s heart has two chambers: an atrium and a ventricle
11. Plasmodium belongs to ———————-
a. Sarcodina
b. Ciliata
c. Flagrllata
d. Sporozoa
Feedback: Plasmodium, a genus of parasitic protozoans of the sporozoan subclass Coccidia that are the causative organisms of malaria. Plasmodium, which infects red blood cells in mammals (including humans), birds, and reptiles, occurs worldwide, especially in tropical and temperate zones.