__________ selection is the type of natural selection that acts on characteristics that determine reproductive success.

a) Reproductive
b) Sexual
c) Endocrine
d) Reducing
e) Hormonal


Answer: b) Sexual

Biology & Microbiology

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Which of the following statements is true concerning dark-field microscopy?

a. This type of microscopy uses specific stains to enhance the contrast of certain bacteria. b. The condenser does not allow light to pass directly through the specimen but directs the light to hit the specimen at an oblique angle. c. Dark-field microscopy allows the visuali-zation of larger viruses. d. Dark-field microscopy can differentiate various difficult-to-grow organisms by using immunofluorescence.

Biology & Microbiology

The genotype aa is referred to as

a. heterozygous. b. hybrid. c. homozygous recessive. d. homozygous dominant. e. codominant.

Biology & Microbiology

________ is the most common coenzyme involved in energy metabolism

Fill in the blank with correct word.

Biology & Microbiology

You, as a cell biologist, discover that there is strong evidence that chloroplasts, found in plant and algal cells, are descended from bacteria but not eukaryotes. What theory would explain this finding?

A) endosymbiont B) macroevolution C) bottleneck D) back to front

Biology & Microbiology