In most cases, the first product of a particular biosynthetic pathway represses the enzymes of the pathway
Indicate whether the statement is true or false.
Answer: FALSE
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When a DNA molecule is replicated, the daughter molecules contain one strand of parental DNA and one strand of newly synthesized DNA; this is called ________ replication.
A. conservative B. semiconservative C. dispersive D. hemiconservative
Which of the following structures all contain valves?
a. arteries and veins b. arteries and heart c. arteries, capillaries, heart d. lymph capillaries, arteries, heart e. lymph capillaries, veins, heart
Conservation is concerned with applying scientific knowledge to prevent the loss of biodiversity. Which of the following human activities is least likely to threaten biodiversity?
A) organic farming B) habitat destruction C) overexploitation D) introduced species
Which of the following is/are TRUE regarding the molecular mechanism of "sensitization" in Aplysia, shown by the gill-withdrawal reflex?
a. The L7 neuron releases 5HT, and this ultimately leads to high levels of Ca2+ entry into the sensory neurons. b. The L29 neuron releases 5HT, and this ultimately leads to high levels of Ca2+ entry into the sensory neurons. c. The L29 neuron releases dopamine, and this ultimately leads to high levels of Na+ entry into the sensory neurons d. None of the above