Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the _____
A) tip of the coleoptile
B) part of the coleoptile that bends during the response
C) base of the coleoptile
D) cotyledon
E) phytochrome in the leaves
Answer: A
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As a physician listens to the heart of a human patient, he hears an atypical "lub" sound. Which part of the heart might be malfunctioning?
A. the AV valve B. the semiliunar valves C. the right atrium D. the right ventricle
The letter “B” in the above figure represents
a. trigger zone. b. output zone. c. input zone. d. conducting zone. e. none of these.
All living organisms are multicellular
Answer the following statement(s) true (T) or false (F)
Which statement regarding genetics is false?
A) In keeping with our greater complexity, the human genome has about 100 times more genes than that of yeast. B) Despite morphological similarities, fungi are more closely related to animals than they are to plants. C) About 99% of the genes of humans and mice are related by descent from a common ancestor. D) The more recently two species have branched from a common ancestor, the more similar we expect their DNA sequences to be.