When a cell responds to a signal it sent, this is an example of
A. endocrine signalling.
B. direct intercellular signaling.
C. contact-dependent signaling.
D. autocrine signaling.
E. paracrine signaling.
Answer: D
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. The compost pile temperature at which pathogens, but not thermophiles, are killed is about 20-30ºC
Indicate whether this statement is TRUE or FALSE.
A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success. What would be the best followup experiment?
A. Count the number of spots on female tails and measure mating success. B. Remove spots or add artificial spots to male tails and determine female responses. C. Measure the sperm count of males and compare to spot count. D. Inject testosterone and observe changes in spot count. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about sexual selection and planning an experiment? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Blood pH is kept near a value of 7.3-7.5 because of
a. salts. b. buffers. c. acids. d. bases. e. water.
In a population where most of the individuals have long, narrow noses, a child is born with a short, broad nose. What's the most likely evolutionary explanation for this variation?
A) Both parents of this child are from another population. B) Humidity in the area is increasing, and selection pressure is changing. C) The child reflects the normal variation around the average type. D) A mutation must have occurred to produce a new allele of the nose shape gene.