What is the key difference between choanoflagellates and sponges?
a) Choanoflagellates are strictly aquatic.
b) Sponges are multicellular
c) Sponges are assymetrical and do not have tissues
d) Choanoflagellates have distinctive flagellated cells that function in suspension feeding.
Ans: b) Sponges are multicellular
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The plant louse Phylloxera was responsible for destroying ____ in Europe
a. orange groves b. orchards c. potato fields d. vineyards e. corn crops
A fossil is defined as any evidence of an organism from
A. at least 500 years ago. B. at least 1000 years ago. C. at least 25,000 years ago. D. at least 10,000 years ago. E. at least 100,000 years ago.
Adaptive immunity is sometimes also called acquired immunity. Which of the following statements provides a basis for the alternative name?
A) Lymphocytes of the adaptive immune system are highly specific for a single antigenic determinant. B) Activated lymphocytes produce daughter cells that are identical in specificity and function. C) To become activated, lymphocytes require exposure to the antigenic determinant for which they are specific. D) Activated lymphocytes may persist for years in the body. E) Lymphocytes reactive to normal body components are removed.
Conidia are sexual spores produced by mushrooms.
Answer the following statement true (T) or false (F)