Facilitated diffusion is specific. This means ____
a. a specific protein will transport certain polar or charged molecules but not others
b. that only one specific integral protein per membrane is involved in facilitated diffusion
c. that the energy molecule ATP is specifically required for transport
d. only specific hydrophobic molecules can be transported
e. that transport of molecules occurs only in specific cells
A
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Imagine you are talking to your friend who is very excited because he has just transduced his first batch of bacteria in the laboratory. What does this mean?
A. He introduced a gene of interest into his bacteria using viruses. B. He introduced a gene of interest into his bacteria using other bacterial species that can form pili. C. He introduced a gene of interest into his bacteria by lysing other bacterial cells and exposing his bacteria to this mixture. D. He produced a strain of antibiotic-resistant bacteria by exposing his bacterial cultures to antibiotics. E. Through periodic selection, he was able to isolate a gene of interest in his bacteria.
What two hormones secreted from the pancreas maintain glucose homeostasis in vertebrates?
A. insulin and glucagon B. epinephrine and glucagon C. epinephrine and insulin D. cortisol and glucagon E. cortisol and insulin
The most important experimental result that suggested to Watson and Crick that DNA was in the form of a helix was
a. the finding of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C. b. Griffith's results with transformation. c. the discovery that DNA is wound around histone proteins. d. X-ray data from Rosalind Franklin . e. understanding DNA replication.
Secondary metabolites are produced to
A. deter competitors. B. aid in reproduction. C. deter herbivores. D. aid in growth. E. deter competitors and aid in reproduction.