Which of the following organelles has both an outer and an inner membrane?

(a) endoplasmic reticulum
(b) mitochondrion
(c) lysosome
(d) peroxisome


(b)

Biology & Microbiology

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Deformities in frogs are thought to be related to ________

a. pesticide contamination b. infections of a parasitic fluke c. excess nutrients in water from agricultural runoff d. all of the choices

Biology & Microbiology

Symbiotic chemosynthetic bacteria obtain oxygen from their hosts through:

a. hemoglobin. b. myoglobin. c. sulfide-binding proteins. d. luciferin. e. breaking down cellulose.

Biology & Microbiology

Which of the following statements about pinecones

is true? a. Cones are exclusively female structures. b. Cones are the result of pollination. c. One type of cone produces microspores. d. Pollen grains are retained within male cones. e. Microspores develop into female gametophytes within the ovule.

Biology & Microbiology

An open circulatory system usually consists of which of the following?

a. blood b. pumping organ c. arteries d. veins e. hemocoel

Biology & Microbiology