How are most eukaryotic mRNAs degraded?
What will be an ideal response?
Ans: Most eukaryotic mRNAs are degraded by deadenylation; that is, exonuclease attack on the 3? terminus that eventually breaches the poly(A) tail.
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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
A mammalian female’s
a. cells usually have multiple Barr bodies. b. body is a mosaic for the X-linked traits she inherits. c. Barr bodies are active in some cells. d. Barr bodies are produced after puberty. e. X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell.
Which of the following scenarios is explained by adaptive radiation?
A. The toxicity level of the bark of a species of plant increases due to constantly being attacked by aphids. B. The color pattern of the moths living in the woods of England become darker as the levels of pollution increase during the Industrial Revolution. C. The average running speed of a cheetah increases each generation due to the gazelles getting faster. D. All of these are examples of adaptive radiation.
The synthesis/presence of cyclin is what turns on the Cdk as the Cdk is always present but it is the cyclin that is synthesized and degarded in cycles.
a. true b. false