X-linked or sex-linked traits are expressed in males but not in females
Indicate whether the statement is true or false
FALSE
Explanation: Such traits are expressed most commonly in males due to their hemizygosity, but can be expressed in females homozygous for the X-linked alleles.
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One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+), as noted below
If the pH of blood increases, one would expect _____. A) a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3- B) an increase in the concentration of H2CO3 and a decrease in the concentration of HCO3- C) a decrease in the concentration of HCO3- and an increase in the concentration of H+ D) an increase in the concentration of HCO3- and a decrease in the concentration of OH- E) a decrease in the concentration of HCO3- and an increase in the concentration of H2CO3 and H+
Enzymes ____
a. change the rate of a reaction b. change the direction of a reaction c. change the free energy of a reaction d. are used up in a reaction e. are present in concentrations approaching their substrates' concentrations
The average synonymous substitution rate in mammalian mitochondrial genes is ________ the average rate for nuclear genes
A) 2 times B) 5 times C) 10 times D) 50 times E) 100 times
A mutation in which one of the following genes can lead to breast cancer?
A) BT05 B) HeLa C) BRCA1 D) BCG E) BCG2