The most recent techniques developed in the biological sciences allow the manipulation of DNA with the ultimate goal of intervening directly with the ________ fate of organisms.
A. genetic
B. developmental
C. mitotic
D. adult
Answer: A
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Plant and animal development share a number of features, but differ in major ways. Which of the following is a key difference between plants and animals?
A) Animals typically produce gametes by meiosis; plants produce gametes by mitosis. B) Animal cells frequently undergo programmed cell death; plant cells do not. C) Animal development is controlled by regulatory gene sets such as Hox genes; plants have no similar control systems. D) Animal gametes are produced only after maturity is reached; plant gametes are produced throughout a plant's lifetime.
What compound diffuses through open stomata into plant tissues thereby initiating photosynthesis?
a. water molecules b. oxygen gas c. carbon dioxide d. potassium ions e. calcium ions
Contraction of the fibers labeled A in the accompanying figure results in:
a. elongation of the body.
b. elongation of the tentacles.
c. elongation of the gastrovascular cavity.
d. shortening of the body.
e. expansion of the pedal disk.
Which of the following organisms has a dominant sporophyte generation and a free-living gametophyte generation?
A) moss B) fern C) mushroom D) conifer