Integrins are integral membrane proteins. They are often attached to _____
A) the membranes of intracellular organelles
B) cytoskeletal proteins and proteins in the extracellular matrix
C) the outside of the plasma membrane
D) glycogen molecules and other types of cellular inclusions
Answer: B
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Scientists know that there has been a steady rise in atmospheric CO2 level since 1850 because ________
a. carbon isotope dating techniques indicate that this is so b. pockets of ancient atmosphere remain in Antarctic ice c. graphs of current increases can be extrapolated back in time d. reports by early researchers are stored in libraries
Which biologist first proposed that all organisms share a common ancestry?
A) Aristotle B) Linnaeus C) Whittaker D) Woese E) Darwin
Which component of a DNA nucleotide could be removed without breaking the polynucleotide chain?
A) Phosphate B) Nitrogen base C) Deoxyribose D) Ribose
The reserve food in angiosperm seeds is stored in a special tissue called:
A) nectar. B) the sporophyte. C) the seed coat. D) endosperm.