Which of the following is the driving force pushing blood out of the heart?
A. Contractions of skeletal muscles
B. Ventricular systole.
C. Venous valves
D. Respiratory movements
E. Gravity
Answer: B
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The blood-brain barrier is effective against ________
A) alcohol B) anesthetics C) nutrients such as glucose D) metabolic waste such as urea
Protein digestion begins in the
A. mouth. B. esophagus. C. stomach. D. small intestine. E. large intestine.
When the ribosome reaches a stop codon, its A site binds a protein called a release factor instead of a tRNA. the release factor causes the finished protein to break away from the ribosome. which step of translation does this describe?
a) elongation b) transcription c) termination d) initiation
Which type of skin cancer is the most common?
A. Malignant melanoma B. Basal cell carcinoma C. Squamous cell carcinoma D. Malignant carcinoma