Results from the study of globin variants indicate that ____
a. all amino acid substitutions cause severe phenotypic effects
b. a change in a single nucleotide is sufficient to cause a genetic disorder
c. extended chains of phosphorus molecules function to carry oxygen
d. all of the changes in globin are due to changes in amino acid sequences
e. sickle cell anemia is not primarily an inherited disease
b
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Which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids, and steroids?
A) ribosome B) lysosome C) smooth endoplasmic reticulum D) mitochondrion E) contractile vacuole
In recombinant DNA techniques, the gaps in the paired DNA fragments are closed by ____
a. restriction enzymes b. DNA ligase c. DNA polymerase d. DNA replicase e. reverse transcriptase
What does the normal protein that is encoded
by the “cystic fibrosis” gene do?
a. transports chloride ions across membranes b. delivers chloride ions to the endoplasmic reticulum c. binds chloride ions to DNA prior to gene expression d. binds chloride ions to bacteria so they are more easily recognized by white blood cells e. the normal protein does more than one of these things
While establishing a symbiotic relationship, plant hosts communicate with bacteria via secretion of flavonoids and bacteria release Nod factors to communicate with the plant.
Answer the following statement true (T) or false (F)