How many replication forks are there at an origin of replication?
A. four
B. two
C. three
D. one
E. five
Answer: B
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Match the following items to the correct phrase.
_______1. Facultative anaerobes. _______2. Microaerophiles. _______3. Some species are aerotolerant anaerobes and some species are obligate anaerobes. _______4. Fastidious bacterial pathogens that will grow on chocolate agar but not on blood agar. _______5. Capnophiles. _______6. Acid-fast bacteria. a. Neisseria gonorrhoeae and Campylobacter spp. b. Clostridium spp. c. E. coli, most Staphylococcus and Streptococcus spp. d. Mycobacterium and Nocardia spp. e. Neisseria gonorrhoeae and Haemophilus influenzae
Desertification is mainly caused by ____
a. lack of rain b. poor agricultural practices c. too much precipitation d. deforestation e. erosion
The rapid growth of the human population is a concern because ___
a. natural resources are abundant b. the carbon hectare is increasing c. if we continue to grow, the population will exceed Earth's biocapacity d. as a population increases, so does its per capita ecological footprint e. all of the above
A mutation in mice leads to overgrowth of the Sertoli cells, so they span across the diameter of the seminiferous tubules. What phenotype would you expect to see?
A. infertility due to lack of mature sperm entering the epididymis B. infertility due to lack of mature oocytes C. overproduction of sperm, so they clog the bulbourethral gland D. overproduction of testosterone