Which term describes a community and the nonliving environmental factors with which it interacts?
a. ecosystem
b. planet
c. multicellular organism
d. biosphere
e. community
a
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You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. protein. C. DNA. D. lipid.
Mussels and sponges sometimes contain methanotrophs as intracellular symbionts because the methanotrophs
A. allow the partnership to use hydrogen sulfide as a source of electrons. B. remove otherwise toxic levels of methane from the environment. C. convert methane to carbohydrate for use by the host. D. All of the choices are correct.
Which list correctly describes the sequence of events that occurs during cell division, beginning at interphase?
a. nuclear division, DNA replication, cytoplasmic division b. DNA replication, cytoplasmic division, nuclear division c. cytoplasmic division, nuclear division, DNA replication d. nuclear division, cytoplasmic division, DNA replication e. DNA replication, nuclear division, cytoplasmic division
A student carries out PCR using the following steps: Step 1: 94°C for 1 minute Step 2: 60°C for 30 seconds Step 3: 72°C for 30 seconds Which of the following lists the CORRECT terms for these three steps?
A. denaturation of the double-stranded template, extension of the new DNA molecules, primer annealing B. degradation of the template, primer annealing, extension of the new DNA molecules C. denaturation of the double-stranded template, primer annealing, extension of the new DNA molecules D. denaturation of the double-stranded template, extension of the new DNA molecules, hybridization of the template E. hybridization of the single-stranded templates, primer annealing, extension of the new DNA molecules