The male-specific region of the Y chromosome
A) lies between the two pseudoautosomal regions.
B) is completely identical to its counterparts on the X chromosome.
C) has an abundance of protein-encoding genes.
D) has regions called amplicons that include few palindromic sequences.
A) lies between the two pseudoautosomal regions.
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Which of the following is true concerning the life cycle of a moss?
a. Gametophytes are nutritionally dependent upon sporophytes. b. Emerging gametophytes arise from germinated spores. c. The zygote is protected within specialized tissues of the sporophyte. d. Spores are produced within reproductive bodies called antheridia.
The only part of the nervous system under
voluntary control is the ___ nervous system.
a. somatic b. autonomic c. central d. sympathetic e. parasympathetic
Mitochondria are thought to have evolved from ancient bacteria. Which characteristics of a free-living bacteria have mitochondria lost over time?
A) an independent genome B) ribosomes C) phospholipid membranes D) motility E) ribosomes, phospholipid membranes, motility, and an independent genome
As part of your research project, you travel to an island to learn more about the habitats and relationships of flies, spiders, and centipedes. You and your assistant plot out five different areas on the island and count the numbers of flies, spiders, and centipedes living in each plot. Your results show the following: Plot Flies Spiders Centipedes1300254242617103147152147397805791393Based in the information provided, the best explanation for the low numbers of spiders and flies in plot 5 is:
A. centipedes prefer spiders to flies. B. there were not enough flies to support a large centipede population. C. centipedes are actively consuming flies and spiders. D. there were not enough spiders to catch and consume all the flies.