All muscles share four traits. All are excitable, contractile, extensible, and ________
Fill in the blank(s) with correct word
elastic
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All of the following are polysaccharides except
A. agar used to make solid culture media. B. a cell's glycocalyx. C. dextran in some bacterial slime layers. D. cellulose in certain cell walls. E. sterols in cell membranes.
The minimum age of the LUCA (last unique common ancestor) is the age of the oldest fossils that can be identified with certainty as close relatives of present-day prokaryotes and eukaryotes. Such fossils are about ________
A) 3.8 billion years old B) 2 billion years old C) 542 million years old D) 3.28 billion years old E) 65 million years old
The accompanying figure shows the percentage of pairwise genetic comparisons within sample populations of living hominids, graphed against the percentage of sequence divergence for each pair. We can conclude from the figure that ________
A) any randomly selected pair of humans in the world should differ in their mitochondrial DNA sequences by less than 6% B) humans are more genetically diverse than Western chimpanzees C) hominid species do not differ significantly in levels of genetic diversity D) humans share a more recent common ancestor with bonobos than gorillas E) All of the above.
What are the results of double fertilization?
A) Egg cell and sperm cell B) Diploid zygote and diploid endosperm C) Embryo sac and pollen sac D) Triploid endosperm and diploid zygote E) A zygote and an embryo