Which bond can break most easily?
A. Ionic bond
B. Covalent bonds
C. Polar covalent bond
D. Hydrogen bond
E. Magnetic bond
Answer: D
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What type of species, if removed from the community, could lead to the collapse of the entire community?
A. Invasive species B. Indicator species C. Keystone species D. Flagship species
If modern humans came from Africa, what explains the loss of pigmentation seen in different races?
A. Since there was less sunlight, darker pigmentation wasn't needed. B. The lighter-pigmented humans are found in colder climates, where having less pigmentation preserves heat. C. The diet found in the areas where lighterpigmented humans are found contain compounds that interfere with the production of pigmentation. D. Lighter pigment allows for more efficient production of vitamin D, an advantage in areas with less sunlight. E. None of the answer options is correct.
Treponema pallidum is similar in shape to
A. Escherichia coli. B. Staphylococcus aureus. C. Leptospira interrogans. D. herpes virus.
Which of the following organelles has the ability to catabolize alkanes found in oil and petroleum products?
A) mitochondria B) smooth endoplasmic reticulum C) peroxisomes D) lysosomes E) late endosomes