Biologists have described about _____ species of eukaryotic organisms, of which about _____ are animals. The majority of these are _____
A. 1.8 million; 1.3 million; insects
B. 1 million; 500,000; vertebrates
C. 30 million; 1 million; insects
D. 30 million; 500,000; plants
E. 1.8 million; 500,000; plants
A
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Transcriptionally active genes are characterized by:
A. an increase in H1. B. the presence of bound nucleosomes at the promoter regions. C. the presence of specialized chromosome remodeling complexes. D. the absence of histone variants such as H2AZ and H3.3. E. All of these choices are correct.
What are the openings in the periderm of some plants called?
a. stomata b. fistulae c. lenticels d. gonopores
The ____ gives structure to many unwalled, single-celled protists
a. contractile vacuole
b. pellicle c. Golgi body d. endoplasmic reticulum e. nucleus
Which of the following is not a greenhouse gas?
A) N2O B) CO2 C) CH4 D) N2