Why is it important that a few ?-galactosidase molecules be present in E. coli even if these cells have been growing on
a lactose-free medium? What will be an ideal response?
It is important so that when lactose is present, some of it will be converted to allolactose,
which induces the lactose operon.
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Which of the following is a net product of glycolysis? Select all correct choices
A. 2 pyruvate B. 2 ATP C. 2 NADH
In humans, a deletion from chromosome 5 typically leads to severe mental retardation and a malformed larynx; this
disorder is known as ____.
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome
Scientific inquiry in biology is linked in a concept map with two sets of understanding researchers might pursue in experiments. Which of these is a good example of why concepts are linked between what is studied and how it might be studied?
A. Environmental changes over recent decades have led to studies of whether specific plants and animals can adapt to the changes. B. A research physician hypothesizes that a new skin therapy will result in healthier skin tissues for healing. C. The influenza virus is spreading rapidly throughout the population and is not being controlled by the current flu medication. D. All of the answer choices are correct. E. A newly identified bacterium in African soils is found to promote plant growth that a researcher will study in crop production.
What are the most abundant plasma proteins that also establish the osmotic pressure of the plasma?
A. hemoglobin B. fibrinogens C. astrocytes D. albumins E. gamma globulins