Sexual selection can 

A. change the gene frequency.
B. lower the reproductive rate.
C. prevent natural selection.
D. not be a selecting agent.


A. change the gene frequency.

Biology & Microbiology

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Mutation rates are similar in Bacteria and Archaea, yet certain stressful conditions mutation rates increase. Why is the mutation rate not constant and close to zero all of the time?

A) Increased mutation rates can be advantageous in rapidly changing environments because some random mutations may be useful for survival. B) Microorganisms carefully control the mutation rate of their DNA to match the environmental conditions and maximize evolution. C) The increased mutation rate under stressful conditions is an indication that the microorganisms can no longer replicate their DNA properly and are about to die. D) Constant mutation rates would halt evolution completely.

Biology & Microbiology

Which of the following causes a noncommunicable pulmonary infection that resembles tuberculosis?

A. Mycobacterium kansasii B. Mycobacterium fortuitum complex C. Mycobacterium scrofulaceum D. Mycobacterium avium complex (MAC) E. Mycobacterium marinum

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Energetically favorable reactions help cells build biomass

What will be an ideal response?

Biology & Microbiology

The scientist(s) given credit for adding the third component (which contradicted spontaneous generation) to the cell theory is/are

A. Louis Pasteur. B. Mathias Schleiden and Theodore Schwann. C. Robert Hooke. D. Rudolf Virchow. E. Antony van Leeuwenhoek.

Biology & Microbiology