Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 41, Problem 3CT

Some sperm mitochondria enter an egg during fertilization, but as sperm nature these mitochondria are tagged with a protein (ubiquitin) that marks them for destruction. What organelle carries out this destruction process?

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As a sperm cell finally approaches its final target, its acrosome becomes activated.  The acrosome is a specialized organelle found in the cell’s head region and activation results in the exocytosis of several types of proteolytic enzymes. Name 2 specific proteins you might expect the enzymes released by the acrosome to breakdown. What purpose does this play in the fertilization of the egg? Explain your reasoning.
Sperm need significant amounts of ATP to fuel their travel through the reproductive tract. This ATP is generated via oxidative metabolism of the glucose and fructose contained in the seminal fluid.     These sugars are large polar molecules that enter sperm cells via glucose transporters or GLUTS.  One such GLUT protein is depicted in the image below.  When GLUTS recognize and bind glucose, they undergo a conformational change releasing glucose on the other side of the membrane. Due to the persistent high energy demands of the sperm cell, these sugars are continually being catabolized (broken down).  GLUTs mediate what type of transport of glucose and fructose across the membrane? ________________  Is this an active or passive process? _________________        What type of transport protein are the GLUTs described in this question? ___________________    How many transmembrane domains does this GLUT have?  _______________
In mitosis, why do the chromosomes need to condense in prophase and line up in metaphase?  (To be clear, this is asking about the usefulness of these specific actions, not just that those things need to happen as part of the overall process.)
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY