Attributes of Welwitschia mirabilis include
_____ It has only two leaves.
_____ It obtains most of its water from seasonal heavy rains.
_____ It lives under desert conditions.
_____ It is a gnetophyte.
_____ Its stems are photosynthetic, but its leaves are not.
__X__ It has only two leaves.
_____ It obtains most of its water from seasonal heavy rains.
__X__ It lives under desert conditions.
__X__ It is a gnetophyte.
_____ Its stems are photosynthetic, but its leaves are not.
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Which of the following Mycoplasma species is associated with individuals who are positive for human immunodeficiency virus (HIV), is capable of invading human cells, and can modulate the immune system?
a. M. pneumoniae b. M. genitalium c. M. hominis d. Mycoplasma fermentans
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms were in place. Angiosperms make up 95% of all modern plant species. Which of the following may help explain the rapid success of angiosperms?
a. Use of the wind to disperse pollen and seeds b. Flowers and fruits help protect and disperse both pollen and seeds c. Use of the wind to disperse spores d. Use of water to disperse pollen and seeds e. Animals eating the plants helped to disperse both pollen and seeds
The specific compound that is capable of receiving light energy as the first step in sensory transduction is
A. rhodopsin. B. melanin. C. vitamin A. D. cone opsin. E. retinal.
In biology class, Joan makes careful observations using a microscope of stained cells undergoing meiosis. During which phase of meiosis will she see homologous chromosomes first pair up?
A) anaphase I B) prophase I C) metaphase II D) metaphase I