A human cell and a mouse cell were experimentally fused, and the results demonstrated that ________
a. proteins cannot move laterally in the membrane
b. large polar molecules can enter cells only through transport proteins
c. proteins can move laterally in the plasma membrane
d. human/mouse chimeric embryos are not viable
c
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What is a feature of woody stems (in temperate regions) but not of herbaceous stems?
A. Bud scale scars. B. Internodes. C. Nodes. D. Axillary buds. E. Shoot tip.
Which of the following statements is FALSE?
a. Heat loss represents a one-way loss of energy from an ecosystem. b. Organisms in the food chain can use all the energy contained in the food that they eat. c. In some ecosystems, the majority of the energy stored in plants does not become available until the plants die. d. Heat and energy are lost by each organism in the ecosystem. e. The two food webs are classified as grazing and detrital.
Metabolism of uncultured organisms can be inferred from partial-genome sequence data since ________.
A. the organisms may be grown in the laboratory once the analysis is complete, and the metabolic pathways can be studied B. metabolic pathways do not vary among organisms C. comparison of genes and the proteins they encode with genes from known organisms allows researchers to gain insight into the metabolic pathways of proposed organisms D. the genomes can be spliced into vectors and the proteins made by alternative organisms
While observing cardiac muscle under a microscope for the first time, Jennifer noticed lines running perpendicular to the direction of the muscle. These lines are called
A. Haversian canals. B. intercalated disks. C. perpendicular plates. D. Broca's area. E. Volkmann canals.