In the ABC model of flower development in
Arabidopsis thaliana, sepals form when gene(s)
__________ is(are) switched on.
a. A
b. A and B
c. B and C
d. C
e. A and B and C
Answer: a
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Answer the following statements true (T) or false (F)
1. Phagocytes can only ingest objects that they are able to attach to. 2. The terms “leukemia” and “leukopenia” both refer to an abnormally low number of circulating leukocytes. 3. Ehrlichia spp. are intraleukocytic pathogens. 4. Chemokines are chemotactic agents that are produced by various cells of the human body. 5. Perspiring, swallowing, and urinating are all considered to be part of the first line of defense.
Gap junctions ____
a. seal the spaces between cells b. allow ions and small molecules to pass between cells c. allow plant cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall
If the DNA nucleotides read ATG-CGT-GAC, the amino acid sequence of the resulting polypeptide would be
a. tyrosine - alanine - leucine. b. methionine - arginine - asparagine. c. histidine - glycine - proline. d. serine - lysine - glycine. e. serine - lysine - isoleucine.
Which of the following regulates paracellular transport?
A) adherens junctions B) gap junctions C) desmosomes D) tight junctions E) hemidesmosomes