In transmission electron microscopy, spreading a specimen out in a thin film with uranyl acetate, which does not penetrate the specimen, is called
A. shadow staining.
B. freeze-etching.
C. simple staining.
D. negative staining.
Answer: D
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What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
Match the plant process or characteristic with the location in which it occurs in the cell
A) nucleolus B) porins C) cytoplasm D) outer membrane of mitochondria E) inner membrane of mitochondria F) Golgi complex G) matrix of mitochondria H) extracellular space I) intermembrane space of mitochondria 1) glycolysis 2) citric acid cycle 3) phospholipid synthesis 4) ?-oxidation 5) electron transport
Packaging of prokaryotic chromosomes
A) doesn't involve histone or histone-like proteins. B) involves large regions of positively supercoiled DNA but lacks histones or histone-like proteins. C) is very simple and lacks higher-level structure, such as looped domains. D) involves structural RNA molecules that contribute to the formation of looped domains. is essentially the same as eukaryotic DNA packaging.
Early death associated with obesity has recently been termed
A. sudden infant death syndrome (SIDS). B. sedentary death syndrome (SDS). C. wasting disease. D. nutritional deficiency disease (NDS).