Gap junctions ____
a. seal the spaces between cells
b. allow ions and small molecules to pass between cells
c. allow plant cells to communicate with each other
d. give the cell its shape
e. anchor the cell membrane to the cell wall
ANSWER: b
You might also like to view...
Radish flowers may be red, purple, or white. The part of the radish we eat may be oval or long. A cross between a red-flowered long radish plant and a white-flowered oval radish plant yields all-purple long radish offspring
Then the F1 are crossed. In the resulting F2 generation, which of the following phenotypic ratios would be expected? A) 9:3:3:1 B) 9:4:3 C) 1:1:1:1 D) 1:1:1:1:1:1 E) 6:3:3:2:1:1
The trait of medium-sized leaves in iris is determined by the genetic condition PP?. Plants with large leaves are PP, whereas plants with small leaves are P?P?. A cross is made between two plants each with medium-sized leaves. If they produce 80
seedlings, what would be the expected phenotypes, and in what numbers would they be expected? A) 20 (large leaves), 20 (medium leaves), 40 (small leaves) B) 40 (large leaves), 40 (medium leaves), 0 (small leaves) C) 40 (large leaves), 0 (medium leaves), 40 (small leaves) D) 10 (large leaves), 60 (medium leaves), 10 (small leaves) E) 20 (large leaves), 40 (medium leaves), 20 (small leaves)
Application of fertilizers to aquatic ecosystems stimulates primary production just as it does in agricultural ecosystems. In aquatic ecosystems, the enhanced production can eventually lead to:
A) accumulation of toxic heavy metals. B) anoxic conditions. C) conditions more attractive to recreational activities. D) increase in food web complexity.
Aerobic training ____.
A. makes skeletal muscles more resistant to fatigue B. promotes break down of actin and myosin C. is fueled mostly by creatine phosphate D. produces muscle fibers that fatigue quickly E. makes skeletal muscles become rigid and stiff