Plant cells are protected from the harmful effects of excessive light energy and reactive oxidative molecules by
A) mitochondria.
B) chlorophyll.
C) carotenoids.
D) ATP.
Answer: C
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According to the figure above, which of the following explains why the red panda is an important species to preserve?
A) Red pandas are a symbol of conservation efforts. B) Red pandas live in areas that are critically endangered. C) Seals are more important to preserve than the red panda because the ocean environment is critically endangered. D) Phylogenetically distinct species are high-priority species to target for conservation.
A channel that opens in response to changes in ionic charge across a membrane is called a ____
a. voltage-gated channel b. ligand-gated channel c. charge-gated channel d. electric-gated channel e. positive-gated channel
During which phase of aerobic respiration is ATP
produced directly by substrate-level phosphorylation? a. glycolysis b. ethanol production c. acetyl-CoA formation d. the Krebs cycle e. glycolysis and the Krebs Cycle
Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide
b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis