The alternative pathways for viral infection—lytic and lysogenic—are determined by positive and negative regulatory effects of proteins produced by the virus following infection
A. true
B. false
A
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Which of the following best describes the chemical equation for photosynthesis?
A. Carbon dioxide + Sugar + Energy = Oxygen + Water B. Water + Carbon dioxide + Energy = Sugar + Oxygen C. Oxygen + Sugar = Water + Carbon dioxide + Energy D. Oxygen + Water + Carbon dioxide = Sugar + Energy
In bone, crystals of calcium phosphate impregnate the extracellular matrix containing fibers of
A. troponin. B. myosin. C. actin. D. chitin. E. collagen.
Fruit flies, mollusks, and humans all have insulin-like hormones and receptors, even though molecular studies suggest
that their last common ancestor existed more than 800 million years ago.
Indicate whether the statement is true or false.Four of the following are characteristic of morphogens. Which one is the exception?
A. They are long-range signals in pattern formation. B. They are encoded by master genes. C. They affect gene splicing. D. Their concentration decreases with distance from source. E. They affect development.