You are doing field study work with a scientist studying spiders in the Amazon rainforest. You come across a previously undiscovered species of spider and set up a video camera with a zoom lens to observe it closely without disturbing it. You see the
female spider lay two eggs, kill an ant that tried to eat one of the eggs, and preserve the ant to feed the hatchlings the next day. She lays two more eggs as soon as the two offspring grow larger and leave. When your mentor asks for a monthly update, what exciting news do you have for her about this species?
A) It exhibits unusual zero population growth tendencies.
B) It exhibits unusual K-selected tendencies.
C) It exhibits unusual intelligent learning tendencies.
D) It exhibits unusual r-selected tendencies.
Answer: B
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Dolphins have a beak whereas porpoises have a rounded blunt head
Indicate whether the statement is true or false
Matching. Choose the one most appropriate answer
for each. 1. ___ Avery 2. ___ Chargaff 3. ___ Franklin 4. ___ Griffith 5. ___ Hershey and Chase 6. ___ Pauling 7. ___ Miescher 8. ___ Watson and Crick A. discovered that the hereditary system of one strain of bacteria could be transformed by the hereditary system from another strain of bacteria B. first to discover DNA and isolate it from fish sperm C. discovered that DNA-digesting enzymes prevented bacterial transformation D. the first to build an accurate model of DNA and to describe it explicitly in a publication E. the first to demonstrate, through the use of radioactive isotopes, that DNA, not protein, is the genetic material F. provided two important clues to the structure of DNA; one clue is that A = T and the other is that C = G G. described the alpha helix H. obtained excellent X-ray diffraction photographs that suggested that DNA was a long, thin molecule with regularly repeating units
A biology student takes fish, algae, pond plants, invertebrates, and bottom sediment from a local pond and establishes them in an aquarium. When the system is stable, the student seals it into a large, airtight glass box and leaves the box in a sunny
location. After 3 months, the organisms in the aquarium appear alive and healthy. Which statement about the experiment is true? A) No energy has entered or left the glass box during the 3 months. B) Some of the energy in the system has moved from one organism to another during the 3 months. C) The air in the glass box contains no carbon dioxide. D) During the 3 months, the biomass of animal life was greater than the biomass of plant life.
In precipitation tests, maximum precipitation takes place when
A) the amount of the antibody exceeds the amount of the antigen. B) the amount of the antigen exceeds the amount of the antibody. C) the amount of the antibody and the amount of the antigen are at optimal proportions. D) a toxin is present. E) a complex solution of many antibodies is used.