Answer the following statements true (T) or false (F)
1. Sodium and potassium ions can easily diffuse through the lipid bilayer of plasma membranes.
2. Transport of salts against their concentration gradients is energetically expensive.
3. If you measured the urine concentration of a freshwater fish, you would find that it was more concentrated than its blood.
4. If you measured the urine concentration of a saltwater fish, you would find that it was more concentrated than its blood.
5. Sweat has a higher salt concentration than the blood does in humans.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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Which of the following pertains to both tetanus and foodborne botulism?
A. They are caused by enterotoxins of the pathogen. B. They occur when endospore-contaminated soil enters deep wounds. C. Nausea and diarrhea are symptoms. D. An exotoxin blocks acetylcholine release. E. Treatment involves antitoxin therapy.
Which genus contains Gram-positive bacteria?
a. Neisseria b. Staphylococcus c. Kokuria d. Salmonella
One gene can have multiple effects on an organism.
A. True B. False
The human genome is composed of approximately how many base pairs?
A) 3 billion B) 10 billion C) 30 billion D) 100 billion E) 1 trillion