Wilting of a plant occurs ____
a. if the plant is placed in an isotonic solution
b. if there is a rise in turgor pressure
c. as a result of facilitated diffusion
d. if the plant is placed in a hypertonic solution
e. if the plant is placed in a hypotonic solution
ANSWER: d
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Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ______.
A. zygote B. karyotype C. embryo D. oocyte
Plant cells grow primarily by increasing ____
a. cell number through cell division b. cell size through cell differentiation c. pressure and volume of the central vacuole d. the amount of extracellular matrix e. the concentration of lignin
With __________, an animal stops responding to an ongoing stimulus.
Fill in the blank(s) with the appropriate word(s).
If biologists consider Ensantina klauberi and Ensatina eschscholtzii to be different species, they would likely argue that postzygotic isolating mechanisms had reinforced speciation.
a. true b. false