A pattern of inheritance in which the form of a single trait is collectively determined by alleles of several genes is called _______.
A. polygenic inheritance
B. pleiotropic
C. multiple allele system
D. codominance
E. epigenetic
Answer: A
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Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into fragments. 2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA (siRNA) and are destroyed. 3. A virus infects the host plant, injecting ssRNA into the cell. 4. Viral genome is replicated and dsRNA molecules are formed. 5. siRNA bind to a plant protein complex, which retains only one of the RNA strands. A. 3 2 1 4 5 B. 1 2 4 3 5 C. 5 3 4 2 1 D. 1 2 3 4 5 E. 3 4 1 5 2
Which of the following serves as the "translator" or intermediary between an mRNA codon and an amino acid?
A. rRNA B. snRNA C. tRNA D. siRNA E. snRNPs
What is wood?
a. secondary xylem that has accumulated outside a cylinder of vascular cambium b. secondary xylem that has accumulated inside a cylinder of vascular cambium c. primary xylem that has accumulated outside a cylinder of vascular cambium d. primary xylem that has accumulated inside a cylinder of vascular cambium e. vascular cambium cells
A neutral atom of chlorine has an atomic number of 17, it has _____electrons in its 3rd shell.
a. 2 b. 17 c. 8 d. 7