A sterile hybrid plant can form a new fertile species if its chromosomes are doubled. This is referred to as ____
a. allopatric speciation
b. cladogenesis
c. a hybrid zone
d. anagenesis
e. sympatric speciation
ANSWER: e
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The molecule of heredity is usually
A) RNA. B) DNA. C) protein. D) carbohydrate. E) None of the choices is correct.
What is the adaptive value of natural antibiotic production for fungi?
A) Bacteria use fungi for food. B) Bacteria spoil the food that the fungi need for their own nutrition. C) Bacteria are the main competitors with fungi for food. D) Bacteria inhibit the reproduction of fungi.
Answer the following questions true (T) or false (F)
1. A relatively early hominin with advanced tool technology was Homo ergaster. 2. The brain of Australopithecus afarensis was almost the same size as that of modern humans. 3. Australopithecus afarensis represents a hominin with both ape-like and human-like characteristics.
A cell is placed in a solution that is hypotonic to the cell. Which of the following best describes movement of water in this situation?
a. Water will only flow into the cell. b. Water will only flow out of the cell. c. Water will flow into and out of the cell, but the overall net movement will be out of the cell. d. Water will flow into and out of the cell, but the overall net movement will be into the cell.