Which of the following is not one of the basic types of animal tissue?
1.epithelial
2.connective
3.muscle
4.vascular
4
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In gram-positive Bacteria, the cell walls are composed mainly of thick ________ layers
A) protein B) poly-?-hydroxybutryic acid (PHB) C) lipopolysaccharides (LPS) D) peptidoglycan
Match the following items with the correct phrases.
_______1. _______________ are chemical mediators that enable cells to communicate with each other. _______2. When attached to the surface of particles or cells, ____________________ can facilitate phagocytosis. _______3. Proteins produced by one bacterial species that kill other bacterial species are known as ____________________. _______4. ____________________ are small, antiviral proteins that are produced by virus-infected cells. _______5. ____________________ attract leukocytes to sites where they are needed. a. bacteriocins b. chemotactic agents c. complement fragments d. cytokines e. interferons
N-linked glycosylation at an Asn-X-Ser/Thr consensus sequence adds approximately _______ sugar(s) in a single step to the protein.
a. 1 b. 15 c. 30 d. 100
Eggs and scales are features that enabled reptiles to dominate land during the Permian period
Indicate whether the statement is true or false