Biology, 06.04.2021 04:10 Donlito8535
You have discovered a new organism with a very simple actin cytoskeleton. In the resting state this cell has a lot of short actin filaments underneath the plasma membrane. These actin filaments are capped at their plus ends by the capping protein Gelsolin. The minus ends of these filaments are NOT capped and there are no other proteins bound to the actin filaments. The actin filaments in this resting cell are not growing or shrinking. When the cell receives a stimulus to move it generates a lipid called PI(4,5)P2 which we will learn about later in the course. This lipid binds to Gelsolin and inactivates it releasing the actin filaments. Based on this (fictional) story answer the following questions:
a. What is the concentration of G-actin in the resting cell?
b. In the resting cells why are the actin filaments not growing or shrinking?
c. What will happen to the actin filaments when Gelsolin is inactivated in the stimulated cell? Will they grow, shrink or stay the same? Why?
Answers: 3
Biology, 22.06.2019 00:00
The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s
Answers: 3
Biology, 22.06.2019 06:30
Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.
Answers: 2
Biology, 22.06.2019 08:20
Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups
Answers: 1
You have discovered a new organism with a very simple actin cytoskeleton. In the resting state this...
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