Which of the following statements about cellular metabolism is FALSE?
A) Glycolysis is inhibited when cellular energy levels are abundant.
B) Citric acid cycle activity is dependent solely on availability of substrate; otherwise it is unregulated.
C) In the electron transport chain, electrons decrease in energy level as they are transferred from one electron carrier to the next.
D) Reactions of the citric acid cycle take place in the mitochondrial matrix.
Answer: B
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Which one of the following elements is likely to form exactly three non-ionic interactions with hydrogen?
A. phosphorus B. oxygen C. carbon D. sulfur E. chlorine
Answer the following statements true (T) or false (F)
1. One function of cell walls in plants is to prevent the continual increase in the expansion of the cell membrane. 2. The plant cell can move substances into cells using proton pumps that work against a gradient. 3. Diffusion of water across membranes occurs through channels formed by proteins known as aquaporins. 4. Active transport in plants works against a concentration gradient and this allows for substances to pass through plant cells without an energy input. 5. If your plants are wilted, this is an indication that the turgor pressure in cells of that plant are low.
Sister chromatids are separated from each other during _______.
a. prophase I b. prometaphase II c. anaphase I d. anaphase II
The hypothesis that organic molecules formed near deep sea hydrothermal vents is called the:a
iron-sulfur world hypothesis. b. iron-clay hypothesis. c. organic sea hypothesis. d. prebiotic soup hypothesis. e. sulfur vent hypothesis