In the symbiotic relationship that produces lichens, a(n) __________ feeds the fungus.

A. plant
B. mycelium
C. bryophyte
D. alga


D. alga

Biology & Microbiology

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The presence of cholesterol in the plasma membranes of some animal cells _____

A) enables the membranes to stay fluid when cell temperature drops B) enables the cell to remove hydrogen atoms from saturated phospholipids C) enables the cell to add hydrogen atoms to unsaturated phospholipids D) makes the cell membrane less flexible, allowing it to sustain greater intracellular pressure E) reduces mutations to genetic material inside the cell

Biology & Microbiology

What is the sequence and polarity of the DNA strand complementary to the strand 5? AAATGTCCATGC 3??

A) 5? TTTACAGGTACG 3? B) 3? AAATGTCCATGC 5? C) 3? TTTACAGGTACG 5? D) 5? UUUACAGGUACG 3? E) 3? UUUACAGGUACG 5?

Biology & Microbiology

Arthroscopic surgery is used to repair damage to the knee. What sorts of things can go wrong that can lead to damage in someone's knee?

What will be an ideal response?

Biology & Microbiology

Natural killer cells destroy target cells by:

a. releasing antibiotics, which break down the cell membranes. b. releasing cytokines, perforins, and granzymes. c. releasing histamine, which signals other blood cells to aggregate. d. phagocytosis, after the cells are targeted by antibodies. e. releasing lysosomal enzymes, which digest the target cells.

Biology & Microbiology