Sperm cells form within a rounded structure called ____ in bryophytes and some other plants
a. antheridium
b. stoma
c. strobilus
d. sporangium
e. archegonium
ANSWER: a
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If molecular techniques predict the phylogeny shown here, which of the following shows the expected order of appearance of species in the fossil record from earliest appearing to most recently appearing?
A. chara, liverworts, hornworts, lycophytes B. chara, lycophytes, liverworts, hornworts C. lycophytes, hornworts, liverworts, chara D. lycophytes, liverworts, hornworts, chara E. hornworts, chara, lycophytes, liverworts
Researchers studying the rigidity and flexibility of the cell envelope used chemotaxis to measure the ability of microbes to squeeze through tight spaces. E. coli, a gram-negative bacterium, was able to traverse narrower channels than B. subtilis, a gram-positive microbe, even though both cells are the same size when grown without restriction. E. coli has the more flexible cell envelope because
A. it has only a single membrane. B. lipopolysaccharide has no charge. C. it has fewer flagella. D. there is less structural carbohydrate. E. there are fewer protein receptors.
These images show examples of
1.red algae
2.green algae
3.brown algae
4.xanthofucoids
During which phase of mitosis does cytokinesis occur?
A) Anaphase B) Prophase C) Metaphase D) Telophase