The thick filament is composed almost entirely of ________ molecules.
A. myosin
B. thrombin
C. troponin
D. tropomyosin
E. actin
Answer: A
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Producers are at which trophic level?
a. first b. second c. third d. fourth or higher e. The level varies with different ecosystems.
Which structure containing dense connective tissue is found in the skin?
A) epidermis B) hypodermis C) dermis D) integument
Which statement about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.
A homozygous tomato plant with red fruit and yellow flowers was crossed with a homozygous tomato plant with golden fruit and white flowers. The F1 all had red fruit and yellow flowers
The F1 were testcrossed by crossing them to homozygous recessive individuals and the following offspring were obtained: Red fruit and yellow flowers—41 Red fruit and white flowers—7 Golden fruit and yellow flowers—8 Golden fruit and white flowers—44 How many map units separate these genes? A) 17.6 B) 15 C) 17.1 D) 18.1