What event initiates development?

A. Cleavage
B. Gastrulation
C. Organogenesis
D. Fertilization


Answer: D

Biology & Microbiology

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Several new materials have been developed for use in the microbiology lab. These materials must be sterilized before use, but cannot withstand a temperature over 60oC and can't be exposed to water. Which method of sterilization would be applicable?

A. Oven-dry heat B. UV radiation C. Steam autoclave D. Ionizing radiation

Biology & Microbiology

What special feature of the ovum is facilitated by the production of polar bodies? 

A. large size of the cell B. extra layers of plasma membrane C. triploidy D. large size of the nucleus

Biology & Microbiology

________ are positively charged particles in the soil that attract anions

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the following represents acclimation?

A) Deeper beaks evolve in a population. B) Marine lionfish are able to tolerate freshwater in estuaries. C) Tropical trees grow taller than temperate ones to compete for light. D) Poisonous animals are brightly colored to ward off predators.

Biology & Microbiology