Lactose transport by membrane proteins occurs under conditions in which the concentration of lactose inside the cell is higher than the concentration outside the cell. What type of transport is used to move lactose into the cell?
a. Simple diffusion
b. Active transport
c. Osmosis
d. Facilitated diffusion
Ans: b. Active transport
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True or False: Although most behaviors are influenced by multiple genes, in Drosophila foraging behavior is influenced by a single gene with two different alleles (for S and for R)
A. true B. false
The mitochondrial genome would be most useful for studying evolutionary relationships among which group of organisms?
A. plants (members of the kingdom Plantae) B. eukaryotes (members of the domain Eukarya) C. all organisms (members of domains Bacteria, Archaea, and Eukarya) D. whales (members of the order Cetacea) E. animals (members of the kingdom Animalia)
Which of the following dilution schemes results in a 1:100,000 dilution? (Choose all that apply)
> Step 1: transfer 1ml from the original sample to flask A with 99ml diluent; step 2: transfer 1ml from flask A to flask B with 99ml diluent; step 3: plate a 0.1ml sample from flask B > Step 1: transfer 1ml from the original sample to flask A with 9ml diluent; step 2: transfer 1ml from flask A to flask B with 9ml diluent; step 3: plate a 1ml sample from flask B > Step 1: transfer 0.1ml from the original sample to flask A with 9.9ml diluent; step 2: transfer 0.1ml from flask A to flask B with 9.9ml diluent; step 3: plate a 0.1ml sample from flask B > Step 1: transfer 10ml from the original sample to flask A with 90ml diluent; step 2: transfer 10ml from flask A to flask B with 90ml diluent; step 3: plate a 1ml sample from flask B
Utilizing more motor units for stronger muscle contractions is called
A. fast-twitching. B. fatigue. C. aerobic capacity. D. recruitment. E. insertion.