When animal cells are grown in a petri dish, they typically stop dividing once they have formed a single, unbroken layer on the bottom of the dish. This arrest of division is an example of
A) mitosis S phase.
B) density-dependent inhibition.
C) lack of nutrients.
Answer: B
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Xylem consists of which cells?
a. tracheids only b. sieve elements only c. vessel elements only d. sclerenchyma fibers and sieve elements e. tracheids and vessel elements
The study of the observable is
a. science. b. optics. c. hypothesis. d. critical thinking. e. visualization.
Place the steps of sporulation in the correct order.1. Replication of DNA2. In-folding of the plasma membrane to enclose a copy of DNA, forming forespore and septum3. Engulfment of the forespore with a second membrane4. Deposition of spore cortex5. Spore coat formation6. Maturation and release of endospore
What will be an ideal response?
What do eudicots have that is not present in monocots?
A. parallel venation B. internodes C. leaf blade D. nodes E. netted venation