Classification of organisms into three domains is based on
A) the presence of a cell wall.
B) the number of cells in the organism.
C) cellular organization.
D) nutritional requirements.
E) cellular proteins.
C
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Most of the organic sulfur is located in
A. fatty acids and lipids. B. monosaccharides and carbohydrates. C. amino acids and proteins. D. nucleotides and nucleic acids.
Which of the following does not require expenditure of energy?
A. accumulation of ions inside a cell B. transport against a concentration gradient C. flow of sucrose and other carbohydrates once inside the sieve tubes D. the loading and unloading of carbohydrates from the sieve tubes E. opening or closing stomata
Responsible scientists provide ____ to back up their statements
a. hypotheses b. predictions c. evidence d. controls e. problems
An example of microbial ________ is the ability of Vampirococcus to attach to the outer membrane of its prey and then secrete degradative enzymes that result in the release of the prey's cytoplasmic contents.
Fill in the blank(s) with the appropriate word(s).