Which of the following terms best describes an organism that cannot exist in the presence of oxygen:
a. obligate aerobe
b. facultative aerobe
c. obligate anaerobe
d. facultative anaerobe
Ans: c. obligate anaerobe
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In the ABC model of flower development in
Arabidopsis thaliana, carpels form when gene(s) __________ is(are) switched on. a. A b. A and B c. B and C d. C e. A and B and C
In an attempt to become more environmentally conscious, a woman changes her lifestyle
She begins to grow the majority of her own food in her yard without using pesticides or synthetic fertilizers, she walks rather than taking the car for trips shorter than 5 kilometers, and she uses solar and wind for her power. By taking these actions, she is A) increasing her intake of bioaccumulated compounds. B) increasing her nitrogen cycling. C) increasing her greenhouse gas output. D) decreasing her carbon footprint. E) increasing the number of endocrine disruptors to which she is exposed.
Which statement is CORRECT concerning animal viruses?
a. Enveloped viruses are surrounded by a lipid and carbohydrate coat, which is made from the host cell's mitochondria. b. The genome of animal viruses is always single-stranded. c. Capsid proteins are produced in the nucleus. d. Retroviruses use an enzyme called reverse transcriptase, which synthesizes DNA by copying RNA.
In terms of the number of species, the most successful class of arthropods is
A. Hexapoda. B. Chelicerata. C. Myriapoda. D. Chilopoda. E. Crustacea.