You find an Arabidopsis plant in your greenhouse that lacks stamens and carpels, and has two rows of petals and sepals. What happened to cause this abnormal flower development?
A. a deleterious mutation of gene C
B. an overexpression of gene B
C. a deleterious mutation of gene A
D. a deleterious mutation of C and overexpression of E
E. a deleterious mutation of C and overexpression of A
E. a deleterious mutation of C and overexpression of A
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In the biosynthesis of nucleotides, pyrimidines are assembled starting with ribose-5-phosphate while ribose-5-phosphate is added after synthesis of the nitrogenous base for purines.
Answer the following statement true (T) or false (F)
The E. coli lac operon encodes three genes. These genes
a. cleave lactose into glucose and galactose, produce transacetylase, and actively transport lactose into the cell. b. encode for an enzyme that cleaves glucose, a transport protein for active transport, and a transacetylase enzyme for solubilizing lactose in the cytosol. c. encode for an enzyme that cleaves lactose, a transport protein for active transport of lactose, and a transacetylase enzyme whose function is still unknown. d. catalyze the synthesis of lactose from glucose and galactose, produce transacetylase, and actively export lactose from the cell. e. directly interact with the lac repressor and initiate their own transcription.
Which of the following are true statements regarding
the use of DNA in evolutionary comparisons? a. Lineages have a mixture of ancestral and novel characters. b. Mutations inevitably change those sequences over time. c. Mutations occur randomly. d. Most mutations are neutral. e. All of these are true.
Mammalian appendages with similar bone structures can be used for flying, swimming, running, or grasping. These are examples of ________ structures
Fill in the blank(s) with correct word