A) It has far less cytoplasm as well as less DNA than in an uncleaved zygote B) It has almost equal quantity of cytoplasm as an uncleaved zygote... View Article
A) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation B) Acrosome has a conical pointed structure used for... View Article
A) until after the ovum has been penetrated by a sperm B) shortly after ovulation before the ovum makes entry into the Fallopian tube C) in the... View Article
A) oxytocin released from maternal pituitary B) both placenta as well as fully developed foetus C) fully developed foetus only D) placenta... View Article
A) Fifth month B) Fourth month C) Third month D) Sixth month Answer:Â A) Fifth month Explanation: Pregnancy in humans lasts normally for 9... View Article
A) glucose and calcium B) fructose and calcium C) ribose and potassium D) DNA and testosterone Answer:Â B) fructose and calcium Explanation:... View Article
A) rete testis to vas deferens B) testicular lobules to rete testis C) epididymis to urethra D) vas deferens to epididymis Answer:Â A) rete... View Article
A) adrenal cortex and secrete adrenaline B) ovaries and secrete progesterone C) pancreas and secrete cholecystokinin D) seminiferous tubules... View Article
A) 20th day B) 14th day C) 11th day D) 5th day Answer:Â B) 14th day Explanation: The LH surge (secreted by the anterior pituitary) induces... View Article
A) All sperms except the one nearest to the ovum lose their tails B) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona... View Article
A) escaping any possible compression by the visceral organs B) maintaining the scrotal temperature lower than the internal body temperature C)... View Article
The number of cells in a tissue, and thus the size of that tissue, is determined not only by the rate of cell birth by division but also by the... View Article
In several cultured vertebrate cell lines, the duration of G1, and hence entry into the cell cycle, seems to depend on some threshold rate of... View Article
Growth and division are coordinated by multiple mechanisms in animal cells. The coordination of division and growth is attained in animal cells... View Article
Cells monitor the levels of the many types of nutrients in the environment and adjust their metabolism accordingly, leading to changes in growth... View Article
Several eukaryotic cells supervise the levels of different nutrients in the environment and conform their rates of growth and metabolism... View Article
Unlike yeast cells, the cells of multicellular organisms divide only when the organism as a whole needs new cells to build or maintain tissues.... View Article
Cell growth takes place in the absence of cell division for the production of large cells, namely oocytes and neurons and oocytes. However, the... View Article
In a proliferating cell population, maintenance of cell size requires that a cell doubles in mass during each cell cycle. To coordinate growth... View Article
