Why do amphibians need a moist environment?
A) Amphibians eat only aquatic organisms.
B) Amphibians require a moist environment to support their body weight because their cartilaginous skeleton is weak.
C) Their eggs have only a jelly-like coating that needs to stay moist.
D) Amphibians require a moist environment for their scales to develop.
E) The gills of the adult won't work if they dry out.
C
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Indirect development in sea urchins involves the presence of a _________________ stage.
Fill in the blank(s) with the appropriate word(s).
The oldest known fossils suggest that the __________ may have been the first plants to inhabit land
a. mosses b. hornworts c. ferns d. angiosperms e. liverworts
What is the frequency of the B allele?
A) 0.001 B) 0.002 C) 0.100 D) 0.400 E) 0.600
Which of the following accurately describes transcriptional control of gene expression in eukaryotes?
a. Activators trigger sequences of DNA transcription factors to be expressed b. Dependent on interactions of mRNA sequences with ribosomes c. Promoters help transcription factors bind to RNA polymerases d. Transcription factors help RNA polymerase bind to promoter sequences