Briefly describe how it is possible for large annelid tube worms to survive at a hydrothermal vent on the seafloor far
from any light source and photosynthetic organisms. What will be an ideal response?
ANSWER: At hydrothermal vents, hot water rich in dissolved minerals spews out from an opening on
the ocean floor. The water is seawater that seeped into cracks in the ocean floor at the
margins of tectonic plates and was heated by heat energy from within Earth. Minerals in this
water settle out when it mixes with the cold deep-sea water. Chemoautotrophic bacteria and
archaea that obtain energy by removing electrons from minerals are the main producers. Food
webs include diverse invertebrates, including large annelid tube worms.
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The space between the cell membrane and the cell wall is important during aerobic respiration. Why?
A. Pyruvate is transported into the space to be converted into acetyl coenzyme A to enter the Krebs cycle. B. Hydrogen ions are transported out into the space to set up a hydrogen gradient. C. Oxygen combines with electrons in that space to form water. D. Cytochrome electron carriers are located in the space.
Type II survivorship curves ____
a. are characteristics of humans and elephants b. typify a population in which all ages have an equal chance of survival c. indicate a high mortality rate in the very young d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age
e. are typical of annual plantsLong protein strands that form a web that traps blood cells and platelets to form a clot are called ________
Fill in the blank(s) with correct word
Which of the following is associated with rough ER?
A) Plasma membrane B) Ribosomes C) Chlorophyll D) DNA E) Lipid synthesis