Organic molecules _______.

a) always contain carbon and hydrogen
b) always contain hydrogen
c) always contain carbon
d) are always food molecules
e) are found only in organisms, hence their name


Ans: a) always contain carbon and hydrogen

Biology & Microbiology

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Carbon dioxide (CO2) is

A. returned to the atmosphere during respiration and fermentation. B. used by marine organisms to make limestone for their hard shells. C. removed from the atmosphere during photosynthesis. D. a source of carbon for autotrophs. E. All of the choices are correct.

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A gap junction is a channel that connects adjacent cells. Which one of the following cannot pass through a gap junction?

A) ions that can regulate heartbeat B) amino acids C) nucleotides D) ribosomes

Biology & Microbiology

In an agricultural field where pesticides are regularly sprayed, there are always some insects

that survive due to some innate resistance based on their genetic makeup. These are the ones that then reproduce so that in future generations there are more insects/pests that are resistant to the pesticides. Over time, this may give rise to an entire population that is resistant to the pesticide. This is an example of

a. homology. b. natural selection. c. experimentation. d. classification

Biology & Microbiology

Which genus or genera of hominin is/are most consistently associated with stone tools?

A) Homo B) Paranthropus C) Australopithecus D) Sahelanthropus E) All of the above.

Biology & Microbiology