How do lycophytes differ from bryophytes?
A. Lycophytes use flowers for reproduction.
B. Lycophytes produce seeds.
C. The dominant stage in a lycophyte is the gametophyte.
D. Lycophytes have tracheids.
Answer: D
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The products of filtration in the renal corpuscle enter the renal tubule through which of the following structures?
A) the proximal convoluted tubule B) the loop of Henle C) the collecting duct D) Bowman's capsule
Scientists have found that the lifetimes of mRNAs coding for pair-rule regulatory elements in Drosophila embryos may last only a few minutes. What does this suggest about the overall developmental plan of an animal body?
A) The role of mRNAs is less important than the position of genes in chromosomes. B) Homeotic genes have greater impact in forming an embryo than mRNA from pair-rule genes. C) Building an animal body requires a sequence of precisely timed steps. D) Timing of pair-rule sequence determination is not as important as spatial signaling.
The inducer for the E. coli lac operon is allolactose produced by the action of permease on lactose.
Answer the following statement true (T) or false (F)
Which branch of biology examines the form and variety of organisms in their natural environment?
a. taxonomy b. natural history c. comparative morphology d. biogeography
e. geology