Endangered species
A. are mainly found in the tropics.
B. are likely to be in danger of extinction in the future.
C. will become extinct in the next 50 years.
D. are in danger of extinction throughout all or most of their range.
E. are those species found only in zoos, aquaria, and museums.
Answer: D
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Some slime molds make structures called plasmodia which:
A. contain several forms of chloroplasts. B. provide movement for the slime molds. C. contain many nuclei in one large cell. D. are part of the reproductive structures.
Miller and Urey's experiment was ground breaking because
A. This was the first example of an experiment being used that inserted oxygen into the prebiotic soup. B. This was the first attempt to apply scientific experimentation to the quest of understanding the origin of life. C. They hypothesized what could have been the first molecules formed, but they could not demonstrate this in a scientific experiment. D. This was the last experiment that used boiling water as a trigger mechanism for the production of macromolecules. E. This was the first experiment based on the theory that organic carbon actually arrived from outer space.
When insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake, this is an example of ____.
A. autocrine signaling B. direct intercellular signaling C. paracrine signaling D. endocrine signaling E. contact-dependent signaling
Elongated photosynthetic cells attached to the upper epidermis in leaves are called ________
a. pericycle b. epidermal cells c. palisade mesophyll d. spongy mesophyll