The ____________ consists of a series of changes the cell undergoes from the time it forms until it ____________ .
Fill in the blank(s) with the appropriate word(s).
cell cycle ; divides
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In the scientific method, hypotheses lead most directly to:
A. predictions B. theories C. experiments D. observations E. conclusions
The expression of the lac operon in an E. coli cell missing the gene that encodes for the lac repressor:
A. will increase when lactose is present. B. will decrease when lactose is present. C. will decrease when glucose is present. D. will increase when glucose is present.
Of the G3P generated in the Calvin cycle, 5/6 will be used to regenerate RuBP. A company
manufacturing widgets would go out of business if 5/6 of the widgets were recycled at the manufacturing site rather than being sold. And yet plants survive this extreme inefficiency. Why?
a. Actually, 5/6 of the G3P is used to build glucose and only 1/6 of the G3P is needed to regenerate RuBP. b. Plants are extremely efficient in other ways and that compensates for this anomaly. c. There is unlimited CO2 for the plant to use, so it's okay to "waste" some by regenerating RuBP. d. The plant expends no energy to acquire the light energy that drives the Calvin cycle, so there is no pressure on the system to become more efficient. e. The cyclic pathway of the light reactions compensates for the energy lost in RuBP regeneration.
Infants require many nutrients early in life, including lipids such as fats. A low-fat diet for infants is not recommended because, among other things, it can affect the development of the nervous system. Why does the developing nervous system need
lipids? A) Fats are needed for energy because infants are often on a low-carbohydrate diet. B) Lipids are needed to produce the polypeptide neurotransmitters used by neurons. C) Glial cells need lipids to produce the myelin sheath. D) Fats are required to generate action potentials on nerve cells.