Traits controlled by sex-linked recessive genes are expressed more often in males because
A) males always carry two copies of these genes.
B) males inherit these genes from their fathers more often than their mothers.
C) males get more doses of the recessive gene than do females.
D) the male has only one gene for the trait.
E) all male offspring of a female carrier get the gene.
D
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After initial processing in the cytoplasm, miRNAs are imported into the nucleus where they bind to pre-mRNAs
A. True B. False
In the internal leaf structure shown above, the item labeled "4" is
a. a vascular bundle. b. spongy mesophyll. c. epidermis. d. a stoma. e. palisade mesophyll.
In phi X 174 phage, whose genome is a single-stranded, circular DNA known as the – strand, replication occurs by the rolling circle method. In which order must the events of replication occur?
A) nicking of the – strand, binding of relaxase protein to the 5? end, DNA synthesis of a + strand, separation of + from – strands, circularization of both strands B) synthesis of a + strand, nicking at the origin, binding of protein to the 5? end, DNA synthesis, displacement of the + strand when replication passes the origin, circularization of the + strand C) synthesis of a + strand, nicking of both strands to separate them, recircularization of both strands D) binding of a protein at the origin of the – strand, synthesis of a + strand, release of the + strand
Answer the following statement(s) true (T) or false (F)
1. The gelatin test requires refrigeration before incubation in order to correctly evaluate the result. 2. An indirect ELISA will only be positive if the patient has an active infection. 3. In an ELISA, the enzyme is conjugated to antibodies from the patient's serum. 4. Mycobacterium smegmatis is expected to be colored blue at the end of a successfully complete Acid-Fast stain. 5. A negative stain begins with a heat fixed smear.