What did experiments with the brown alga Fucus help to determine?
A. The cytoplasm is evenly distributed throughout the algal zygote.
B. The thallus anchors the alga to the surface on which it lives.
C. Light and gravity do not affect rhizoid orientation.
D. Magnesium gradients are important for cell wall formation.
E. A cell wall is required for the zygote to "remember" where a rhizoid should form.
E. A cell wall is required for the zygote to "remember" where a rhizoid should form.
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Harold is so sad that for months he can barely get out of bed. If he does, he just sits at the kitchen table with his head on his hands. Yet for a few weeks, about once every four or five months, he reverses mood. He becomes chatty and animated, uncharacteristically spending lavishly. Harold most likely has
A) schizophrenia. B) euphoria. C) bipolar disorder. D) major depressive disorder.
Ribosomes are composed of
a. proteins only. b. proteins and DNA. c. proteins and RNA. d. glycolipids and DNA. e. glycolipids and RNA.
According to the above figure, which letter corresponds to the area where amino acids are most likely to be reabsorbed?
A. A B. B C. C D. D E. E
All the following are DNA viruses except
A) Picornaviridae. B) Hepadnaviridae. C) Papillomaviridae. D) Herpeseviridae. E) Adenoviridae.