Nonvascular plants
A. include ferns.
B. do not have true stems, leaves, or roots.
C. contain xylem or phloem.
D. are found in dry habitats.
B. do not have true stems, leaves, or roots.
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Production of a neurotoxin that binds to target sites on spinal cord neurons responsible for inhibiting skeletal muscle contraction is a characteristic of ________.
A. Clostridium tetani B. Clostridium difficile C. Clostridium perfringens D. Clostridium botulinum
During receptor-mediated endocytosis, ____.
A. plasma membrane receptors bind molecules to be expelled B. a small channel forms beneath the receptors C. a pit opens inside a cell D. a vesicle forms E. a vesicle is destroyed
Imagine that a random mutation results in a bacterial cell gaining the ability to grow in an environment with a salt concentration of 13%. The population this mutated cell arose from is growing in an environment with a salt concentration of 1.0%. Over the next 3 weeks the salt concentration of the environment fluctuates between 0.9% and 1.0%. What would you predict might happen to the population over these three weeks?
A) In this example the ability to grow in an increased salt concentration provided the mutated cell with a distinct advantage, therefore the mutated cell was selected for and it began to dominate over the three week period. B) In this example the ability to grow in an increased salt concentration did not provide the mutated cell with any advantage, it was not selected for and did not dominate the population over the three week period.
Structures in plants that produce the gametes are called
What will be an ideal response?