Lactose intolerance is due to the body's inability to produce _________.
a. sugar
b. lactase
c. acid
d. lipids
Answer: b. lactase
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If a plant species with 2n = 14 forms an allopolyploid with a plant species with 2n = 18, what would be the likely diploid (2n) number of the allopolyploid?
A) 16 B) 28 C) 32 D) 36
The ____ system delivers nutrients and oxygen to the cells
a. respiratory b. urinary c. digestive d. lymphatic e. circulatory
In yeast signal transduction, the yeast cells
A) must physically and directly interact. B) produce signal molecules that change themselves so they can interact with one another. C) produce response molecules that diffuse to other yeast cells. D) secrete molecules that result in response by other yeast cells. E) mate, after which the new cells secrete hybrid signals.
Which of these does not match the type of cellular transport with the level of energy necessary for its function?
A) simple diffusion: no energy required B) facilitated diffusion channel: no energy required C) facilitated diffusion carrier: energy required D) active transport: energy required E) facilitated diffusion carrier: no energy required