Bacteria called Mycoplasma lack a cell wall. Their cell membrane is stabilized by ____________ and is resistant to lysis.
A) testosterone
B) sterols
C) teichoic acid
D) porin
Ans: B) sterols
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_______ is a change in DNA that can be beneficial, detrimental, or have no effect on a given population.
a. Gene flow b. Genetic drift c. Mutation d. Natural selection
Sperm are formed from the direct maturation
of a. sperm mother cells. b. spermatids. c. spermatogonial cells. d. primary spermatocytes. e. secondary spermatocytes
Given what you know of the inheritance pattern of SCD, is the following pedigree representative of a typical SCD pedigree?
A) Yes; this is a pedigree showing dominant inheritance, and SCD exhibits dominant inheritance. B) Yes; this is a pedigree showing recessive inheritance, and SCD exhibits recessive inheritance. C) No; this is a pedigree showing dominant inheritance, and SCD exhibits recessive inheritance. D) No; this is a pedigree showing recessive inheritance, and SCD exhibits dominant inheritance. E) Another generation is needed before you can determine mode of inheritance.
Sulfolobus are archaea that are commonly found in geothermal environments, with an optimum growth temperature of about 80°C. What feature allows archaea to thrive at such temperatures?
A. Archaea use the heat from their environment to produce ATP. B. Archaeal membranes contain special lipids. C. Archaea have two cell walls which helps prevent heat absorption. D. Archaea are highly adaptable to changing environmental temperatures.