Which of the following is NOT functionally important in cells of the gametophytes of both angiosperms and gymnosperms?
A) haploid nuclei
B) mitochondria
C) cell walls
D) chloroplasts
D
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A few bacteria are capable of growing on gases as the sole source of energy, carbon, and nitrogen. Which of the following combination of gases would support the growth of a bacterium in mineral media with NO other additions?
A) H2, N2, CO2 B) H2, O2, N2, CO2 C) H2, H2S, N2, CO2 D) H2, O2, N2O, CO2
When a cell responds to a signal it sent, this is an example of _____.
A. Direct intercellular signaling B. Endocrine signalling C. Paracrine signaling D. Autocrine signaling E. Contact-dependent signaling
Action potentials are propagated in a one-way direction down a neuron plasma membrane because
a. the action potential is of insufficient intensity to stimulate the voltage-gated ion channels behind it. b. the adjacent channels upstream from the action potential are ligand-gated. c. the adjacent channels upstream from the action potential are in their refractory period. d. voltage-gated ion channels are suppressed. e. the adjacent channels upstream from the action potential are at their threshold potential.
Assume that a cross is made between tall and dwarf tobacco plants
The F1 generation showed intermediate height, whereas the F2 generation showed a distribution of height ranging from tall to dwarf, like the original parents, and many heights between the extremes. These data are consistent with which one of the following modes of inheritance? A) multiple-factor inheritance B) hemizygosity C) codominance D) alternation of generations E) incomplete dominance