Organisms from which kingdom or domain were the first photosynthesizers?

A) Protista B) Bacteria C) Plantae D) Archaea


Answer: B

Biology & Microbiology

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Which of the following choices shows these steps in the correct order?

The steps of DNA fingerprinting are shown below. 1. Isolate DNA from samples 2. Label DNA with fluorescent marker 3. PCR using primers that flank STRs 4. Detection of fluorescent fragments 5. Gel electrophoresis A. 1 - 2 - 3 - 4 - 5. B. 1 - 2 - 3 - 5 - 4. C. 1 - 5 - 3 - 2 - 4. D. 1 - 3 - 2 - 5 - 4. E. 3 - 1 - 2 - 5 - 4.

Biology & Microbiology

The rapid growth of the human population is a concern because ___

a. natural resources are abundant b. the carbon hectare is increasing c. if we continue to grow, the population will exceed Earth's biocapacity d. as a population increases, so does its per capita ecological footprint e. all of the above

Biology & Microbiology

In which structure do cilia covered in mucus trap foreign particles?

a. urinary tract b. reproductive tract c. arteries d. respiratory tract e. digestive tract

Biology & Microbiology

Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful. Why is there a difference?

A. Ctenophores only use nematocycts for feeding, not for defense. B. Ctenphores do not possess nematocysts. C. Nematocysts in ctenophores lack venom. D. Ctenophores have very reduced nematocysts that cannot penetrate human skin.

Biology & Microbiology