Members of which of the following phyla would have a radula and a mantle?
a) Annelida
b) Nematoda
c) Mollusca
d) Porifera
e) Cnetophora
Answer: c) Mollusca
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Which of the following is true of Agrobacterium tumefaciens?
A. It can enter plants through unbroken leaf tissue. B. It is capable of nitrogen fixation. C. It causes crown gall disease when it carries a tumor inducing (Ti) plasmid. D. All of the choices are correct.
What does the 9 + 2 complex refer to?
a. both the Golgi complex and the endoplasmic reticulum b. both the cilia and the nucleus c. both the flagella and the plasma membrane d. both the flagella and the cilia
During clonal selection and antigen binding
A) the B cell interacts with the attached microbe. B) the B cell interacts with a T helper cell. C) the T cell gives off interleukins. D) B cells recognize microbes and their foreign antigens.
Stem cells have determinate cleavage.
Answer the following statement true (T) or false (F)