Which of these statements INCORRECTLY describes an example of pleiotropy?
A. A mutation in a Cl-transport protein causes infertility and excessive mucus in the lungs.
B. A mutation in a gene for microtubule formation causes a defect in sperm motility and cilia movement in the respiratory tract.
C. A mutation in a lipid metabolism gene leads to a buildup of lipids in cells, causing blindness and paralysis.
D. A mutation in the phenylalanine hydroxylase gene can cause mental retardation and loss of motor skills.
E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.
E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.
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Which of the following is least likely to be part of a cell membrane?
A) peptidoglycans B) phospholipids C) glycoproteins D) transport proteins E) enzymes
Growth at two replication forks arising from a single origin of replication produce a "bubble" as daughter DNA molecules form.
Answer the following statement true (T) or false (F)
Additive alleles are those that are epistatic over nonallelic genes that influence the same phenotypic characteristic
Indicate whether the statement is true or false
Specialized parenchyma cells, known as ________ cells, occur along with sieve-tube members.
Fill in the blank(s) with the appropriate word(s).