Red muscle fibers are red because they contain large amounts of ____
a. glucose
b. ribosomes
c. ATP
d. myoglobin
e. hemoglobin
ANSWER: d
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Amplification is an important characteristic of signal transduction pathways involving surface receptors. What is
amplification and how is it accomplished in the cell?
What will be an ideal response?Human chromosome pairs XX and XY are classified as ____
a. centrosomes b. somatosomes c. sex chromosomes d. autosomes e. corposomes
A type of multicellular animal that consists of cells with little specialization is a
A. tapeworm. B. jellyfish. C. sponge. D. bee.
The origin of the mitochondrion and chloroplast is hypothesized to have involved
A. the absorption of RNA from prokaryotic cells. B. prokaryotic cells that became internal symbionts within an early eukaryotic cell. C. the fusion of two archean cells to form an early eukaryote. D. the uptake of free DNA from the environment. E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.