What happens to the actin and myosin filaments when a muscle contracts?
A. Both of them shorten.
B. Myosin shortens, while actin lengthens.
C. Both of them lengthen.
D. Both stay the same length.
E. Actin shortens, while myosin lengthens.
Answer: D
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Beryllium's atomic mass is 9, and its atomic number is 4. How many neutrons are found in a beryllium atom?
A) 9 B) 13 C) 4 D) 5
Life on Earth is dependent on a continued input of energy from the sun.
Answer the following statement true (T) or false (F)
Toxoid vaccines, such as the vaccines against diphtheria and tetanus, elicit a(n)
A) TC cell response. B) immune complex. C) dendritic cell proliferation. D) antibody response against these bacterial toxins. E) antibody response against gram-positive bacteria.
The transmission of enteric hepatitis is most effectively prevented by
A. safe sex practices. B. immunization. C. reducing aerosol dispersion. D. vector control. E. good public sanitation and personal hygiene.