When Griffith Experimented with Two Types of Streptococcus Pneumoniae, He

question 76

Multiple Choice

When Griffith experimented with two types of Streptococcus pneumoniae, he found that if the

• A) deadly strain was heat-killed before injection, the mice died.
• B) non-deadly strain was mixed with the heat -killed, deadly strain before injection, the mice died.
• C) non-deadly strain was mixed with the heat -killed, deadly strain before injection, the mice lived.
• D) non-deadly strain was mixed with the heat -killed, non-deadly strain before injection, the mice died.

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Definitions:

Germinal Center

A region within lymph nodes where mature B cells proliferate, differentiate, and mutate their antibody genes during an immune response.

Efferent Vessel

An efferent vessel is a lymphatic or blood vessel that carries fluid away from an organ or tissue, opposite to an afferent vessel which brings fluid to it.

Afferent Vessel

A vessel that carries blood or lymph fluid towards a particular tissue or organ in the body.

Lymphoid Organ

Lymphoid organs, including the lymph nodes, spleen, and thymus, are part of the immune system and play a role in producing, storing, and carrying white blood cells.