Which main tissue type of the circulatory system enables diffusion across walls of capillaries?
A. connective
B. nervous
C. muscle
D. vascular
E. epithelial
E. epithelial
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If a large 10-km asteroid or comet struck the Earth in the ocean floor, I. large amounts of molten rock would rain down on Earth and cause massive forest fires. II. giant tidal waves would result III. after effects would cause the deaths of most animal life on the planet. IV. thick clouds of dust would form and block out the Sun for an extended period
a. I & IV b. II & III c. I, II, & III d. I, II, III & IV e. II, III, & IV
During animal development, changes in cell position occur extensively during _____.
Fill in the blank(s) with the appropriate word(s).
Some sterilization procedures do not kill all the microbes that may be present. Explain how these procedures may, for practical purposes, still be considered sterilization
What will be an ideal response?
Why are glycolipids found on the extracellular, but not the cytoplasmic, surface of the plasma membrane?
(a) Plasma membrane flippases transport them from the cytosolic face. (b) The enzymes that produce them are present only on the extracellular surface of the plasma membrane. (c) The enzymes that add the sugar groups are confined to the inside of the endoplasmic reticulum and the Golgi apparatus. (d) The oligosaccharides on glycolipids are cleaved off by enzymes found only in the cytosol. (e) They flip spontaneously, after incorporation, due to the hydrophilic sugar head groups.