A treeless region with little rainfall in the far north is the

A. chaparral.
B. desert.
C. tundra.
D. taiga.
E. grassland.


Answer: C

Biology & Microbiology

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In living systems molecules involved in hydrogen bonding almost always contain either oxygen or nitrogen or both. How do you explain this phenomenon?

A) Oxygen and nitrogen are elements found in both nucleic acids and proteins. B) Oxygen and nitrogen are elements with very high attractions for their electrons. C) Oxygen and nitrogen are elements found in fats and carbohydrates. D) Oxygen and nitrogen were both components of gases that made up the early atmosphere on Earth.

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Anything that occupies space and has mass is energy. 2. An element can't be broken down into another form of pure matter. 3. The number of neutrons in the nucleus of an atom gives it a unique chemical nature.

Biology & Microbiology

Fertilization of human eggs usually takes place in the

A. ovary. B. oviduct. C. uterus. D. vagina. E. None of the choices are correct.

Biology & Microbiology

What would you expect the optimum pH to be for the salivary enzyme amylase, which digests starches into sugars?

What will be an ideal response?

Biology & Microbiology