Which of the following characteristics tends to limit bryophytes and seedless vascular plants to habitats that are relatively moist?

A) absence of cuticle
B) presence of flagellated sperm
C) presence of free-living, independent zygotes and early embryos
D) absence of lignified vascular tissues


Answer: B

Biology & Microbiology

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Reactions that use the equivalent of a water molecule to break a molecule into smaller subunits are

called ____ reactions.

a. equilibrium b. hydration c. hydrolysis d. redox e. dehydration synthesis

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Data from the Human Genome Project revealed that humans, considered among the most complex of all organisms,

have fewer genes and less DNA than some "simpler" organisms. Explain how a species can be more complex than another even though it possesses fewer genes. What will be an ideal response?

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Mutations that eliminate a contiguous region in the Drosophila embryo's segmentation pattern are called ________

A) gap genes B) linkage genes C) compartment genes D) segment genes E) homeodomains

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All of the following can be recognized by toll-like receptors, except 

A. flagellin. B. host cell membrane proteins. C. single-stranded viral RNA. D. lipopolysaccharide. E. lipoteichoic acid.

Biology & Microbiology