Penetration of the ovum occurs when the acrosome of the penetrating spermatozoon protrudes through the cell membrane, weakening the out layer of the ovum. Within the cell membrane that encloses the head, and covering much of the area beneath, is an inner layer called theacrosome, which plays ...
What is an example in which the concentration of water is higher outside a cell than inside a cell? What is the term for regions around the nucleus that corresponds to specific energy levels? Electrons are likely to be found here.
The mechanism of memory remains one of the great unsolved problems of biology. Grappling with the question more than a hundred years ago, the German zoologist Richard Semon formulated the concept of the engram, lasting connections in the brain that result from simultaneous “excitations”, whose pr...
The nucleus functions as the brain of eukaryotic cells. The plasma membrane around the nucleus is called the nuclear envelope. Inside the nucleus arechromosomes, which are "chunks" of DNA; the number of chromosomes varies from species to species (humans have 23 distinct kinds, but 46 in all ...
All eukaryotes make their membrane and secreted proteins in the ER, and require some mechanism for routing them out of the ER to various destinations inside the cell, or out of it. One key role of the Golgi is as the main sorting point for all of this post-ER traffic (Figure 3a). ...
What does a cell membrane do? Cell Membranes: Cell membranes are a vital part of any type of cell. Eukaryotic and prokaryotic cells are different in many ways, yet both of them have cell membranes. Eukaryotic cells even have membranes inside their main membrane, surrounding the smaller organell...
What are membrane-enclosed compartments in eukaryotic cells called? Eukaryotic Cells: One of the major characteristics that differentiates eukaryotic cells from other cells such as prokaryotic cells is that they contain membrane enclosed compartments within in their interior. Answer and Explanation: Become...
What is the more complex cell type that has a membrane-enclosed nucleus and organelles that carry out the functions of the cell? What are all the secretory cells in the body? Name the two functional regions of epithelial cells. The cell types found in the epidermis are a. stratum basale,...
What is a nucleus easy definition? 1 :a usually round part of most cells that is enclosed in a double membrane, controls the activities of the cell, and contains the chromosomes. 2 : the central part of an atom that comprises nearly all of the atomic mass and that consists of protons ...
an organelle near the nucleus of the cell that also participates in cell division. The minus end represents the attached end of the microtubule while its opposite is the plus end. The microtubule grows at the plus end through polymerization of tubulin dimers, and the microtubules shrink with the...