The above photomicrograph is of
a. mycelium.
b. protistans.
c. mycorrhizae.
d. stolons.
e. rhizoids.
A
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Two bird species overlap in a hybrid zone. They are isolated by a slight difference in the male songs and by the females' tendency to select males with the "correct" song. Hybrid offspring tend to have reduced fertility compared to either of the parent
species. What effect might natural selection have in this situation? A) Natural selection might favor males with less distinctive calls and/or females that are less "choosy." B) Natural selection might favor males with more distinctive calls and/or females that are more "choosy." As a result, the reproductive barrier between the two species could be reinforced. C) Natural selection could lead to the hybrid species taking over and eliminating the weaker parent species. D) Natural selection could lead to the stronger of the two species taking over and eliminating the other species.
Signals from the parasympathetic nervous system
cause which of the following? a. increase in blood pressure b. increase in pulse rate c. increase in digestive activities d. increase in blood sugar level e. increase in metabolic rate
To investigate the role of cadherin in early development, you continuously treat frog zygotes with antibodies that bind EP-cadherin. You most likely would find that
A) cell division stops but the existing cells organize to form a small, properly organized blastula. B) the cells associate only loosely and fail to form a properly organized blastula. C) the cells associate only loosely but skip the blastula stage to develop into a normal frog. D) the cells divide uncontrollably and form a large tumor-like mass. E) blastula formation and subsequent development proceed normally.
Preassembled nucleaton sites in a living cell are equivalent to the intracellular preference for actin filaments
a. true b. false