Some viruses have an additional coating on the outside of the capsid, acquired from the host cell. What is this additional coating called?
a. plasma membrane
b. nucleic coat
c. envelope
d. proteoglycan
c. envelope
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The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A, B, and C. Based on these data and coupled with the data observed above, substance C is transported via ________.
A) active transport
B) facilitated transport
C) passive transport
D) simple diffusion
E) choices A, B, and C
The mature male gametophyte is produced
A. in the anther. B. within the pollen granule during transfer. C. when the pollen makes contact with the stigma. D. in the pollen tube when the generative cell divides. E. within the ovule just prior to fertilization.
The most important ion in controlling the movement of water into and out of the guard cells is
A. sodium. B. hydrogen. C. carbon. D. nitrogen. E. potassium.
A trait such as albinism is seen with equal frequency in males and females. Two people who do not have the trait might have offspring who do have the trait, at a frequency of approximately one in four. What can you conclude about the inheritance of this
trait? A) dominant, X-linked B) recessive, X-linked C) recessive, autosomal D) dominant, autosomal E) recessive, caused by polyploidy