MCQ Bank
Gametes of ______________ remains one of the best-studied examples of fertilization.
- A) Star fish
- B) Sea cocumber
- C) Sea urchin
- D) Hydra
Egg shell has approximately ________ tiny pores and is made almost entirely of calcium carbonate
- A) 170
- B) 1700
- C) 17000
- D) 17
The ________ diffuses readily in seawater and has a profound chemotactic effect at very low concentrations when added to a suspension of Arbacia sperm.
- A) Melittin
- B) Resacet
- C) Glucagon
- D) Dynein
Protocadherins play important role in separating the notochord from the mesodermal tissues in gastrulation of ________
- A) Xenopus
- B) Rat
- C) Chick
- D) Fish
The first evidence suggesting the importance of sperm in reproduction came from a series of experiments performed by.....
- A) J. L. Prevost
- B) J. B. Dumas
- C) G. J. Mendel
- D) Lazzaro Spallanzani
Eukaryotic genes are contained within a complex of DNA and protein called ________
- A) Nucleoid
- B) Histones
- C) Chromatin
- D) Chromatids
The major motor portion of the sperm flagellum is called .......
- A) Seminal vesicle
- B) Axoneme
- C) Acrosomal vesicle
- D) Acrosome
The ........ is a technique used to study gene expression by detection of RNA in a sample.
- A) DNA extraction
- B) Southern blots
- C) Northern blots
- D) Western blots
Miller found that when sperms were added to oocytes that had not yet completed their ......... , there was no attraction of sperms to eggs.
- A) Cleavage
- B) Mitosis
- C) First meiotic division
- D) Second meiotic division
Transcription begins when RNA polymerase binds to a --------- near the beginning of the gene.
- A) Activator
- B) Promoter
- C) Adaptor
- D) Repressor
It is estimated that the eggs of sea urchins contain 25,000 to 50,000 different types of _____.
- A) SnRNA
- B) mRNA
- C) rRNA
- D) tRNA
The knowledge of gene activity in humans can be obtained by _________
- A) PCR
- B) Positional cloning
- C) Both gene mapping and positional cloning
- D) Gene mapping
The mammalian egg is additionally surrounded by a layer of cells called _____
- A) Jelly coat
- B) Cell wall
- C) Vitelline envelop
- D) Cumulus
The exocytosis of the acrosomal vesicle is caused by the .......... -mediated fusion of the acrosomal membrane with the adjacent sperm plasma membrane.
- A) Magnesium
- B) Calcium
- C) Sodium
- D) Potassium
_______________ is specific for the pancreatic region of the endoderm.
- A) Pdx1
- B) Pdx6
- C) Pax1
- D) Pax6
A.V Leeuwenhoek discovered the sperm in ......
- A) 1600
- B) 1877
- C) 1700
- D) 1678
J. L. Prevost and J. B. Dumas claimed that sperm were not ........ , but rather the active agents of fertilization.
- A) Seeds
- B) Parasites
- C) Mites
- D) Worms
The region of globular actin molecules lies between the nucleus and the acrosomal vesicle in _______
- A) Sea urchin
- B) Sea squirts
- C) Sea horse
- D) Sea anemone
Contact with egg jelly causes the exocytosis of the sperm's acrosomal vesicle and the release of ........... to digest a path through the jelly coat to the egg surface.
- A) Ligases
- B) Proteolytic enzymes
- C) Hydrolytic enzymes
- D) Isomerases
Many eggs contain ultraviolet filters and _____ repair enzymes that protect them from sunlight.
- A) Carbohydrates
- B) DNA
- C) RNA
- D) Proteins