Which of these is NOT a characteristic of sponges?
a) Amoebocyte cells transport food and make skeletal fibers and gametes.
b) Flagellated choanocytes move water.
c) Water enters through a single cavity, the osculum.
d) sessile filter feeders
e) body wall has two cell layers
Ans: c) Water enters through a single cavity, the osculum.
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Which of the following molecules is made up of codons?
a. mRNA b. DNA c. tRNA d. ribosome
A competitive plant growing in wet conditions would be predicted to have
A) a larger root system. B) high tolerance to water stress. C) low metabolic rate. D) many leaves and stems.
Researchers studying groupies in Trinidad found that guppies in streams with high predation reproduced earlier and more frequently. Which of the following is most important in driving the guppies to change their life history in face of predation?
A. The guppies are an equilibrium species. B. The guppies are an opportunistic species. C. Density-independent factors affects the guppy populations. D. Density-dependent factors affects the guppy populations. E. Sexual selection affects the guppy populations.
Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges
Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by _____. A) habitat isolation B) temporal isolation C) gametic isolation D) behavioral isolation