Recall the caterpillar experiment in which caterpillars born in the spring looked like flowers, and caterpillars born in the summer looked like twigs. What is the most likely selective advantage for this difference in body shape?
A) Looking like their food sources allows the caterpillars to move through their environment more efficiently.
B) Development into the adult moth form is faster for caterpillars shaped like twigs than like flowers.
C) Looking like their food source lets the caterpillars blend into their surroundings, reducing predation.
D) Looking like their food source will increase the caterpillars' feeding efficiency; this would increase their growth rate and survival rate.
C
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You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2 µm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan. The new microorganism is
A) most likely a bacterium. B) most likely a eukaryote. C) most likely an archaeon. D) either a bacterium or an archaeon.
Which of the following is false for potassium leak channels?
What will be an ideal response?
The most general of the pituitary hormones, in that it may affect almost any cell in the body, is
a. the adrenocorticotropic hormone. b. the thyroid-stimulating hormone. c. gonadotropin. d. somatotropin. e. prolactin.
Diploid means having
a)one complete set of chromosomes. b)three complete sets of chromosomes. c)two complete sets of chromosomes. d)two chromosomes in each somatic cell. e)two chromosomes in each gamete.