Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright.
B. The crayfish attempted to escape by rapidly swimming backwards.
C. The crayfish turned upside down.
D. The crayfish lay on its side.
E. None of the answers are correct.
Answer: C
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You grow two trays of Arabidopsis plants under identical conditions, except that one tray of plants is exposed to a gentle breeze for several hours each day
Compared to plants grown in calm conditions what would you expect to see in the wind-exposed plants? I. changes in the expression of many genes II. taller flower stalks III. shorter flower stalks IV. more flexible cell walls V. no changes in 2nd messengers VI. increases in 2nd messengers and/or phosphorylated proteins VII. increased levels of Pfr VIII. stiffer cell walls. A) I, III, VI, VIII B) II, IV, V, VII C) III, IV, VII D) VI, VII, VIII E) wind has no effect on plant development
Which of the following statements is correct?
A. All fungi, whether parasite or saprobe, are heterotrophs. B. All saprobes are heterotrophic, but only some are parasitic. C. All heterotrophs are parasites, but only some are saprobes. D. All heterotrophs are fungi, and include both parasites and saprobes.
The movement of genetic material between organisms by any mechanism other than descent is known as ____
a. lateral gene substitution b. polyphyly c. hybridization
d. cloning e. horizontal gene transfer
Identify two different types of mating systems and list the advantages and disadvantages of each. What will be an ideal response?