Female silk moths secrete a chemical called bombykol to attract male silk moths. Bombykol is a
A. stimulus.
B. pheromone.
C. method of communication.
D. All of these answers are true.
B. pheromone.
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Fruit-fly eyes are of the compound type, which is structurally very different from the camera-type eyes of mammals. Even the camera-type eyes of molluscs, such as octopi, are structurally quite different from those of mammals
Yet, fruit flies, octopi, and mammals possess very similar versions of Pax-6. The fact that the same gene helps produce very different types of eyes is most likely due to _____. A) the few differences in nucleotide sequence among the Pax-6 genes of these organisms B) variations in the number of Pax-6 genes among these organisms C) the independent evolution of this gene at many different times during animal evolution D) differences in the control of Pax-6 expression among these organisms
Which of the following traits characterizes gymnosperms?
a) The plants carry exposed seeds on modified leaves. b) Reproductive structures are located in a flower. c) After fertilization, the ovary thickens and forms a fruit. c) The gametophyte is longest phase of the life cycle.
The chemical composition of the prokaryotic cell wall is:
a. carbohydrates and protein b. phospholipids and protein c. carbohydrates and lipid d. water and compatible solutes e. A and can be D, depending on if its a halophile
Which of the following is treated with antibiotics?
A) botulism B) tetanus C) streptococcal pneumonia D) polio E) All of these diseases can be successfully treated with antibiotics.