The protostomes are animals whose
(a) stomach is in front of the crop.
(b) mouth is covered by a fleshy lip.
(c) blastopore becomes a mouth.
(d) digestive tract is lined by mesoderm
(c) blastopore becomes a mouth.
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When Mendel crossed purple-flowered pea plants with white-flowered pea plants, he never got offspring with flowers that had an intermediate color. This was counter to the theory of
A. independent assortment. B. blending inheritance. C. direct transmission of traits. D. segregation of alleles. E. continuous variation of traits.
Match the following items with the correct phrases.
_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes
Which of the following is a characteristic of all fungi?
a. They are prokaryotic consumers. b. They break down food externally. c. They actively move during part of their lives. d. They make their own food. e. They are multicelled.
People who have a single X chromosome are female, while those with XXY sex chromosomes are males. In order to be a female a human
A. must have two X chromosomes. B. cannot have a Y chromosome. C. must have only one X chromosome. D. must have only one Y chromosome. E. cannot have an X chromosome.