You are studying a newly discovered prokaryotic microorganism and are attempting to determine whether it will be classified in the domain Bacteria or in the domain Archaea. All of the following would be helpful in making that distinction except ________.
A. type of membrane lipids
B. presence or absence of double-stranded circular DNA genome
C. presence or absence of peptidoglycan in cell walls
D. sequence of small subunit ribosomal RNA
Answer: B
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a. Ligase b. Gyrase c. Helicase d. Endonuclease
How do flagella bend?
a. myosin motor proteins slide microtubules over each other b. dynein motor proteins slide microtubule doublets over each other c. myosin motor proteins slide actin filaments over each other d. microfilaments contract due to the action of kinesin e. actin filaments contract due to the action of myosin
Quaking aspen can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9 B) 10 C) 19 D) 38
Air pollution over a long period of time can cause this condition
A) malaria B) measles C) emphysema D) influenza