Hemophilia in humans results from an X linked recessive gene. Which of these statements regarding the inheritance of this trait is true?
A. Heterozygous females will exhibit a milder form of hemophilia.
B. All daughters of an affected mother will have hemophilia.
C. Carrier females will always pass the hemophilia allele to their sons.
D. Males who inherit the recessive allele from their fathers will exhibit hemophilia.
E. All sons of an affected mother will have hemophilia.
E
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Spirilli are Gram-negative bacteria that possess internal flagella, which cause the entire cell to twist in a corkscrew
pattern.
Indicate whether the statement is true or false.Which explanation best describes the asymmetrically oriented structure of the proteins in the cell membrane?
a. Each type of protein has its own function. b. These proteins are manufactured by free ribosomes. c. These proteins are initially formed by ribosomes on the rough ER. d. These proteins pass through the ER membrane into the ER lumen. e. Enzymes are needed to modify the carbohydrate chains on these proteins.
In the fluid-mosaic model of the plasma membrane, the phospholipid molecules are oriented so that the ________ heads are facing the outside environment and the ________ tails are facing the interior of the membrane.
A. ectothermic, endothermic B. hydrophobic, hydrophilic C. heterotrophic, autotrophic D. autotrophic, heterotrophic E. hydrophilic, hydrophobic
An inoculated thioglycolate medium culture tube is clear throughout the tube except for dense growth at the bottom of the tube. What is your conclusion?
A. The organisms are obligate anaerobes. B. The organisms are facultative anaerobes. C. The organisms are aerotolerant. D. The organisms are obligate aerobes