Where is external fertilization most likely to occur?

a. mountainous environments
b. tropical environments
c. aquatic environments
d. desert environments


c. aquatic environments

Biology & Microbiology

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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as

A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.

Biology & Microbiology

Division and differentiation of ground meristem gives rise to ____

a. ground tissue b. vascular tissue c. dermal tissue d. protoderm e. procambium

Biology & Microbiology

Ti plasmids and the T-DNA system can be used to transform any vascular plant

Indicate whether the statement is true or false

Biology & Microbiology

Which structure is common to both prokaryotic and eukaryotic cells?

A) Nucleus B) Ribosomes C) Chloroplasts D) Mitochondria

Biology & Microbiology