Which of these is a niche that Cambrian animals occupied?that, as far as we know, their predecessors did not?
A) grazing on microbial mats
B) feeding on organic debris
C) absorbing nutrients across membranes
D) predation while actively swimming
E) None of the above.
D
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If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
The coding sequence of the green fluorescent protein gene (GFP) is placed under the control of an enhancer active in neurons. When this transgene is introduced into flies, GFP will be expressed in
A) all neurons or a subset of neurons. B) all fly cells that have the transgene. C) all cells in the early embryo and then GFP will be silenced. D) all cells in the late embryo after neurons form.
The division of cytoplasm is accomplished during
a. prokaryotic fission. b. interphase. c. meiosis. d. cytokinesis. e. karyokinesis.
Surface barriers, such as cutaneous and mucous membranes, serve the immune system as the __________.
What will be an ideal response?