Which diagram, A or B, corresponds to an “open” circulatory system?
1.A
2.B
1
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What quality of the traits that Mendel chose to study allowed him to establish the basic laws of inheritance?
A. The genes for most of the traits were linked. B. The genes for all of the traits had more than two alleles each. C. The alleles that he studied were either dominant or recessive. D. The epistatic genes for the traits he studied were homozygous recessive. E. The traits he studied were never controlled by two or more genes.
The cephalopod mollusks have
A. a muscular foot. B. tentacles. C. two siphons. D. setae. E. jointed appendages.
What is the term for the cells that are not neural, but support and protect neurons in the nervous system?
a. glial cells b. Peyer's cells c. ganglion cells d. Langerhans cells e. dendritic cells
Which of the following is an undesirable
characteristic of the cuticle? a. It restricts the movement of water. b. It is transparent to sunlight. c. It coats the exposed surface of leaf epidermal cells. d. It restricts the movement of carbon dioxide. e. None of these is undesirable.