Which part of a flowering plant is the immature male gametophyte?
a. style
b. anther
c. sperm cell
d. pollen grain
e. microsporocytes
ANSWER: d
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Why is the exponential growth pattern of population growth primarily theoretical?
a. Limited natural resources b. Zero population growth c. Intraspecific competition d. High mortality rates
Which general term is used to group various biological and behavioral properties of organisms that act to prevent or reduce interbreeding?
A) phyletic evolution B) inbreeding C) reproductive isolating mechanisms D) genetic divergence E) allopatric speciation
According to the concept of punctuated equilibrium, _____
A) natural selection is unimportant as a mechanism of evolution B) given enough time, most existing species will gradually give rise to new species C) a new species accumulates most of its unique features as it comes into existence D) evolution of new species features long periods during which changes are occurring, interspersed with short periods of equilibrium, or stasis
Bacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of
A) their Gram stain reaction. B) the high G + C content of their DNA. C) their spiral shapes. D) the low G + C content of their DNA. E) the presence of LPS in their membranes.