Which group of fishes evolved most recently (in other words, is the youngest)?
A. Jawless fishes
B. Bony fishes
C. Hagfishes
D. Cartilaginous fishes
Answer: B
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The "9 + 2" pattern of the axoneme is nine ________ of microtubules and two additional microtubules in the center called the ________.
A) outer doublets; central pair B) basal bodies; inner two C) central tubules; double pair D) circular structures; middle two E) triplet groups; basal bodies
Gram-stain morphologic features, motility, and flagellar placement are important identifying characteristics of:
a. Chryseobacterium. b. Flavobacterium. c. Pseudomonas. d. Bordetella.
FSH and LH are secreted by the
a. hypothalamus. b. ovaries. c. anterior pituitary. d. testes. e. uterus.
Animal cells typically achieve cytokinesis by
A. forming a cleavage furrow that pinches the cell into two. B. forming a cell plate across the middle of the cell. C. binary fission. D. chromosome condensation. E. chromosome elongation.