Slime molds were once classified as fungi. What characteristics of the slime molds distinguish them from fungi?
A. The vegetative state of the slime mold is mobile and amoeboid.
B. They are flagellated cells at certain stages of the life cycle.
C. Slime molds lack cell walls.
D. All of these characteristics distinguish slime molds from fungi.
Answer: D
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The main reason that mRNA transcripts are modified at the 5' and 3' ends is:
A. to ensure that all nucleotides are phosphorylated. B. to protect the RNA from nucleolytic degradation. C. so that the two ends remain associated with each otherduring transport. D. to guide the removal of introns.
Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage. 2. Large differences in body form can result from only small differences of gene expression. 3. Radiata have neither an anterior end nor a posterior end. 4. All eumetazoans have cell junctions.
While lancelets, members of the lineage ____, live mostly buried in the sand in warm, shallow marine habitats, they
do have well-developed segmented muscles and can move.
a. Petromyzontoidea b. Placodermi c. Cephalochordata d. Urochordata e. Myxinoidea
The symplast transports all of the following except
A) sugars. B) mRNA. C) DNA. D) proteins. E) viruses.