Which of the following is incorrect about gills?
A. In fish, they are protected by an operculum.
B. Terrestrial arthropods also have gills.
C. Fish pump water over the gills.
D. In echinoderms, the gill is a thin sheet of tissue that waves through the water.
Answer: B
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Sister chromatids are best described as two DNA molecules that have ______________
A. the same genes in the same order but that have different alleles. B. the same alleles of the same genes in a different order. C. different genes in the same order and possibly have different alleles of some genes. D. different alleles of the same genes arranged in a different order. E. virtually identical sequences of nucleotides.
Which segment gene is activated first in the Drosophila embryo?
A. pair-rule genes B. segment-polarity genes C. gap genes D. myogenic bHLH genes
The olfactory epithelium is found in the
a. ear. b. nasal cavity. c. eye. d. tongue.
The location of the placenta is
A. in the vagina. B. at the cervix of the uterus. C. lining the oviduct. D. in the uterus.