In bacterial cell division, the cell divides into two nearly equal halves. This process is referred to as:
A. binary fission
B. cytokinesis
C. meiosis
D. mitosis
E. fusion
Answer: A
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When a planarium is cut in half, a head will regenerate from the wounded anterior end and a tail will regenerate from the wounded posterior end. This is an example of
A. conditional specification. B. autonomous specification. C. fate mapping. D. Spemann's organizer. E. transforming growth factor.
The diameter of a blood vessel will be reduced by the contraction of ________
a. cardiac muscle b. smooth and cardiac muscles c. skeletal and cardiac muscles d. smooth muscle e. skeletal muscle
Which of the following best characterizes the monocots?
A) embryo with one seed leaf, leaves with parallel veins, stems with vascular bundles scattered, and flower parts in threes B) embryo with one seed leaf, leaves with parallel veins, stems with a ring of vascular tissue, and flower parts in fives C) embryo with two seed leaves, leaf veins not parallel, stems with ring of vascular tissue, and flower parts in fives D) embryo with two seed leaves, leaf veins not parallel, stems with vascular bundles scattered, and flower parts in threes
The breast cancer gene BRCA1 has a very similar sequence in humans, mice, and gorillas, due to its origination in a common ancestor. The BRCA1 genes in these species are examples of ________.
A. polyploidy B. synteny C. paralogs D. orthologs