Vitamin a plays an essential role in the human body in

1. preventing scurvy.
2. acting as an antioxidant and scavenging free radicals.
3. protecting polyunsaturated fatty acids (pufas) from oxidation.
4. maintaining healthy vision.

3points which of these are associated with a sedentary lifestyle? select the two correct answers. a. physical fitness b. lack of energy c. normal bmi o d. increased risk of disease

Acne is caused by a. a strict diet b. eating at night c. hormones d. dry skin select the best answer from the choices provided. a b c d

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes. b) no; antibiotics do not kill viruses because viruses do not have dna or rna. c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.