Answer:
Los organismos unicelulares se componen de una sola célula que lleva a cabo todas las funciones necesarias por el organismo, mientras que los organismos multicelulares utilizan muchas células diferentes para funcionar.
Answer:
A) reduced synthesis of ovarian steroids despite high levels of gonadotropin hormones.
Explanation:
Menopause is characterized by depletion of ovarian follicles, a reduction of ovarian hormones to castrate levels and elevated levels of serum gonadotropins. Rather than degenerating, the reproductive neuroendocrine axis in postmenopausal women is intact and responds robustly to the removal of ovarian hormones.
Menopause marks the cessation in reproductive cycles of middle-aged women. It is heralded by depletion of ovarian follicles leading to the loss of ovarian hormones with repercussions throughout the body.
The entry of the sperm nucleus is facilitated by C) acrosome reaction. The acrosome is the head-like structure at the front of the sperm cell. This contains digestive enzymes that break down the outer membrane of the egg cell, allowing the nucleus of the sperm cell to enter and fuse with the nucleus of the egg cell.
Answer:
A metabolic pathway is a system of interrelated biochemical reactions that transform a molecule or molecules of a substrate through a series of metabolic intermediates, step by step.
Explanation:
Photosynthesis is a "developing," or anabolic, pathway, which builds sugars out of smaller molecules. Cellular respiration, by comparison, breaks down sugar into smaller particles and is a pathway that is "breaking down," or catabolic. Anabolic pathway: in bigger ones, small molecules are assembled.
Answer:
Types of Roots : Roots are of two types viz. (a) Tap roots(normal or main) and
(b) Adventitious roots.
(a) TAP ROOT-Here the radicle prolongs directly to form a main primary roots when the primary root becomes stronger and persistent, it forms the tap root e.g. roots of dicotyledonous plants.
Primary root forms tap root, its lateral branches are secondary roots; branches of secondary roots in turn produce tertiary roots and so on. The tap root with its branches forms the tap root system.