Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because
A) chloroplasts sense when light is available so that guard cells will open.
B) photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells.
C) guard cells will produce the O2 necessary to power active transport.
D) ATP is required to power proton pumps in the guard cell membranes.
E) chloroplasts sense when light is available so that guard cells will open and guard cells will produce the O2 necessary to power active transport.
Hematopoesis (Genesis of blood cells)
Germ plasm and primordial germ cells (PGC) during gastrulation.
(A) Lymphatic vessel with valves within tissue cells; (B) photomicrograph of lymphatic vessel with v
Types and characteristics of stem cells for culture
Stem Cell Research Could Expand Clinical Use of Regenerative Human Cells
An electron micrograph of a synapse between two nerve cells.