The DNA phage ??174 was found to have a ratio of bases of 25A:33T:24G:18C. This departs from the usual A/T = 1 and G/C = 1 ratios. How can you explain this?
What will be an ideal response?
The genome of the phage consists of single-stranded, rather than double-stranded, DNA.
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When you pick up your backpack and sling into onto your shoulder, your biceps contract
What must occur for your arm to move back down to your side as you walk away?
a. An antagonistic muscle must contract. b. The tendon connected to the biceps must elongate. c. No muscles must contract. d. Not only must an antagonistic muscle contract, but also the tendon connected to the biceps must elongate
The bacterium E. coli
a. is a normal inhabitant of the mammalian gut. b. has some mutant strains that produce toxins and cause disease. c. is grown in laboratories around the world. d. produces vitamin K. e. has all of these characteristics
Which muscle is involved in shrugging your shoulders?
a. serratus anterior b. external oblique c. rectus abdominis d. latissimus dorsi e. trapezius
When the concentration of glucose in the blood rises following digestion of a meal, what is the hormonal response?
A) Levels of both glucagon and insulin increase. B) More glucagon is released. C) More insulin is released. D) Neither glucagon nor insulin is released.