Which of the following biomes is characterized by little rainfall, permafrost, and an average temperature below 0°C?
A. desert
B. taiga
C. temperate deciduous forest
D. grasslands
E. tundra
Answer: E
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Why do more marine mammal offspring survive to adulthood than other animals? a. They expend high amounts of energy
b. They have a high metabolic rate. c. They give a high level of parental care. d. They have fewer offspring.
High energy sources on early Earth, which were most likely involved in the origin of life, included:a
volcanic activity, lightning, and ultraviolet radiation. b. bombardment from meteorites, gamma radiation, and cosmic radiation. c. intense radiation, volcanic activity, and redox energy. d. oxidizing environment, electrical discharge, and geothermal energy. e. infrared radiation, ultraviolet radiation, and oxidizing radiation.
The complexity of microRNA function is that
A) microRNAs can be rRNA, mRNA, or tRNA. B) they range in size from 10 to 10,000 bases. C) a microRNA type can bind several mRNAs, and an mRNA can bind several microRNAs. D) it can be acetylated, phosphorylated, or methylated.
Which polysaccharide bond CANNOT be broken by mammalian enzymes that normally digest polysaccharides?
A) alpha (1->4) glycosidic linkages B) beta(1->6) glycosidic linkages C) phosphate ester linkages D) beta (1->4) glycosidic linkages E) alpha (1->6) glycosidic linkages