Athletes should avoid having drinks containing caffeine, for they are hundred-percent harmful to the athletes’ sports performance.

What is caffeine?

Caffeine can increase anxiety levels.

Bacteria that contain ”empty” plasmid, (plasmid without the eukaryotic gene) would grow? in all four types of broth.|only in the broth containing both antibiotics.|in the broth containing tetracycline, but not in the broth containing ampicillin.|in the nutrient broth plus ampicillin, but not in the broth containing tetracycline.

The most commonly used substances excludes. ( ) A: caffeine B: alcohol C: nicotine D: tea

The specific purpose of the “caffeine sample” is to _____. A: inform the audience of the facts about caffeine and its effects on our body B: inform the audience of the events leading to Ophelia’s death C: persuade the audience to applaud the performance D: persuade Romeo to abandon his family name

Tea contains（ ）and protects against cancer. A: antioxidants B: caffeine C: theanine D: anti-inflammatory properties

The factors enhancing contractility of muscle are () A: Ca2+ B: caffeine C: adrenaline D: hypoxia E: acidosis

You should have three nutritious meals a day to stay healthy. A: valuable to the body as food B: containing rich proteins C: easily digested D: containing little salt

( )is found in both tea and coffee to increase excitability. A: Amino acids B: Caffeine C: Vitamins D: Minerals