Tonoplasts store salts, organic acids, sugars, storage proteins and pigments in plant cells
Indicate whether the statement is true or false.
ANSWER: False - Central vacuoles
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The ability to exist as either a trophozoite or a cyst is characteristic of many
A. fungi. B. viruses. C. protozoa. D. bacteria.
Which of the following correctly describes the fate of the embryonic germ layers?
A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.
At the end of cellular respiration, oxygen combine with electrons of a very low energy level. How are the specific
properties of oxygen beneficial to the organism that uses it as a final electron acceptor?
a. Oxygen is highly reactive and readily accepts electrons. b. Oxygen is strongly electronegative and helps pull the electrons through the electron transport chain. c. Oxygen allows a maximum output of energy for ATP synthesis. d. Oxygen is the only molecule that can act as a final electron acceptor. e. Oxygen is highly reactive and readily oxidizes methane.
The movement of auxin downward from its site of production is referred to as:
a. gravitropism. b. apical dominance. c. nonpolar transport. d. polar transport. e. turgor movement.