Most animal cells are
A) surrounded by a cell wall.
B) attached to each other via plasmodesmata.
C) embedded in an extracellular matrix.
D) embedded in a lipid matrix.
Answer: C
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In gram-negative bacteria, which secretion systems depend on Sec or Tat to first move proteins across the inner membrane?
a. types II and V b. types I and II c. types II and IV d. types V and VI
A(n) ________ is the ring of cytoplasm through a plasmodesmata
Fill in the blank with correct word.
The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?
a. These animals were triploblastic. b. These animals had a proboscis. c. These animals were in phylum Platyhelminthes. d. These animals are placed in the group Lophotrochozoa. e. These animals followed the protostome pattern of embryonic development
The primary difference between enhancers and promoter-proximal elements is that enhancers _____
A) are transcription factors; promoter-proximal elements are DNA sequences B) enhance transcription; promoter-proximal elements inhibit transcription C) are at considerable distances from the promoter; promoter-proximal elements are close to the promoter D) are DNA sequences; promoter-proximal elements are proteins