Control of the lac operon and lactose utilization in bacteria is (select all that apply)A) not induced in the presence of both glucose and lactose.B) only induced when there is glucose but not lactose.C) is a negative control, mediated by a repressor.D) controlled by the expression of three downstream genes.E) preferentially utilizing lactose as a carbon source.
What will be an ideal response?
A, C, D
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To understand the role of zinc in plant growth and development, you grow a tomato plant using hydroponics. Which plant organs do you expect to have developmental defects if you provide the plant with a solution devoid of zinc?
A) leaf development only B) stem development only C) above ground development only D) below ground development only E) All organs will be affected.
Suppose that frog embryos were genetically manipulated so that the epidermal cells expressed both E-cadherin and N-cadherin on their cell surface
The neuronal tissue and epidermal tissues were collected from the embryos and treated as illustrated in Figure 10.15b. Which of the following would you predict would happen now that N-cadherin is also present on the surface of the epidermal cells? A. The modified epidermal cells would adhere to each other and to neuronal cells. B. The genetically modified epidermal cells would adhere to neuronal cells and would no longer adhere to epidermal cells. C. The epidermal cells would adhere to each other, and not to the neuronal cells, because they would still be epidermal cells regardless of the presence of an additional cell adhesion protein on their surface.
The brief reversal of the electric gradient
across a neuron’s plasma membrane is called a(an)
a. action potential. b. resting potential. c. kinetic potential. d. threshold potential. e. energy potential.
Which elements listed below combine to form most of the organic molecules in living things?
A) sulfur, oxygen, hydrogen, nitrogen B) nitrogen, sulfur, oxygen, hydrogen C) helium, carbon, nitrogen, hydrogen D) nitrogen, carbon, oxygen, hydrogen