The pathway of metabolism that involves a series of electron transfers from reduced carrier molecules such as NADH2 and NADPH2 to a terminal electron acceptor is:
a. substrate-level phosphorylation.
b. fermentative metabolism.
c. oxidative phosphorylation.
d. aerobic respiration.
C
Fermentative metabolism is one form of substrate-level phosphorylation. Oxidative phosphoryla-tion is an electron transport system that can use either oxygen as the terminal electron acceptor (aerobic respiration) or acceptors other than oxygen (anaerobic respiration).
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The microbiologist receives a sputum specimen for culture in the microbiology laboratory. Upon receipt the microbiologist should:
a. complete the set-up of media for identifi-cation of pathogens. b. complete a direct Gram stain and prelimi-nary report. c. complete an abbreviated work-up of the specimen. d. complete a culture and definitive identifi-cation of pathogens.
Identify the correct steps and the correct order for cloning a gene of interest
1. Transform the bacteria. 2. Mix the postrestriction endonuclease gene of interest with the postrestriction endonuclease cloning plasmid. 3. Incubate the combined DNA fragments with the liagase enzyme. 4. Use restriction endonucleases to cut the gene of interest and the target DNA. 5. Spread bacteria on medium containing lactose and ampicillin. 6. Spread bacteria on medium containing X-gal and ampicillin.
a. 4, 2, 3, 1, 6 b. 4, 3, 2, 1, 5 c. 4, 3, 2, 1, 6 d. 4, 2, 3, 1, 5 e. 2, 4, 1, 5, 3
Since men produce millions of sperm, but women produce only one oocyte per cycle, in the vast majority of cases infertility is due to a problem with the woman.
Answer the following statement true (T) or false (F)
In a mature tree, the point where the bark can be peeled off the wood is where the ________ lies.
A. vascular cambium B. cork cambium C. periderm D. secondary xylem