Modern nonvascular plants are generally small because they lack leaves
a. True
b. False
ANSWER: False
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A typhoon devastates a population on "island A" and only a few individuals survive. Several generations later, the replenished population suffers from several inherited disorders that are very rare in other groups. A genetic event that explains this is
A) a population bottleneck. B) genetic load. C) a founder effect. D) natural selection.
In the structure of DNA, the total amount of ____________________ and ____________________
equals the total amount of ____________________ and ____________________. Fill in the blank(s) with the appropriate word(s).
Arrange the following structures from largest to smallest, assuming that they belong to two generations of the same angiosperm
1. ovary 2. ovule 3. egg 4. carpel 5. embryo sac A) 4, 5, 2, 1, 3 B) 5, 4, 3, 1, 2 C) 5, 1, 4, 2, 3 D) 4, 1, 2, 5, 3
Structural differences between Gram-positive and Gram-negative bacteria are observed following the Gram-staining procedure since ________.
A. the thin layer of peptidoglycan in Gram-positive bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier allowing the stain to wash out B. the thin layer of peptidoglycan in Gram-negative bacteria is dissolved during the alcohol step, thus acting as an impermeability barrier allowing the crystal violet/iodine complex to be retained C. the thick layer of peptidoglycan in Gram-positive bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier retaining the crystal violet/iodine complex D. the thick layer of peptidoglycan in Gram-negative bacteria is dehydrated during the alcohol step, thus acting as an impermeability barrier retaining the purple stain