Which class includes slugs and snails?
a. Cephalopoda
b. Gastropoda
c. Scaphopoda
d. Bivalvia
Ans: b. Gastropoda
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Tight junctions between muscle cells help muscle tissue function as a unit
Indicate whether the statement is true or false.
In eukaryotic cells, which occurs during mitosis?
a. the duplication of chromatids b. the replication of DNA c. the pairing of homologous chromosomes d. the fragmentation and disappearance of the nuclear envelope and nucleolus e. a cleavage furrow is formed
In a capsule stain, capsules can be seen as ___________ surrounding the cells.
A. Purple cells walls B. Pink cell walls C. Clear halos D. A dark background
In PCR, heating of the DNA is necessary because:
A) it causes the primers to bind DNA. B) it separates the two strands of DNA. C) DNA polymerases require high heat to work. D) it cuts the DNA into fragments small enough to be replicated.