The myofibrils consist of both thin filaments made of actin and thick filaments composed of  

A.  tropomyosin.
B.  myosin.
C.  acetylcholine.
D.  troponin.
E.  chitin.


B.  myosin.

Biology & Microbiology

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Air flow in a microbiology laboratory should be:

a. from lower to higher risk areas. b. minimized as much as possible. c. optimized to prevent the settling of dan-gerous aerosols. d. well-filtered by recirculating it through numerous filters before recycling.

Biology & Microbiology

Secondary endosymbiosis occurs when a

a. photosynthetic eukaryote engulfs a photosynthetic prokaryote. b. photosynthetic eukaryote engulfs a non-photosynthetic prokaryote. c. photosynthetic eukaryote engulfs a non-photosynthetic eukaryote. d. non-photosynthetic eukaryote engulfs a photosynthetic prokaryote. e. non-photosynthetic eukaryote engulfs a photosynthetic eukaryote.

Biology & Microbiology

Which of the following statements is true?

(a) Another name for the fertilized egg cell is the zygote. (b) Diploid organisms reproduce only sexually. (c) All sexually reproducing organisms must have two copies of every chromosome. (d) Gametes have only one chromosome.

Biology & Microbiology

Sexually dimorphic features do no include

A. Body size B. Horns C. Intelligence D. Colored plumage E. Antlers

Biology & Microbiology