The most debilitating external parasites of birds and mammals are spread by
A) a vector.
B) an intermediate host.
C) a definitive host.
D) direct contact.
D
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Microscopic or macroscopic degenerative changes or abnormalities in infected host cells and tissues are called ________.
Fill in the blank(s) with the appropriate word(s).
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 statements are true about DNA replication in eukaryotes? Select all that apply.A) Replication of the entire genome takes about ten minutes.B) A replication fork occurs at each growing point of the replicating chromosome(s).C) Eukaryotes have many different chromosomes, with replication occurring in each at the same time.D) Replication occurs at the rate of about 500-5000 base pairs per minute.E) Multiple sites of replication are present on each chromosome.
What will be an ideal response?
A friend of yours is wondering about the differences between the words orientation and navigation when these two terms are used in descriptions of bird migrations. Since you have studied and know something about animal behavior, what do you tell your friend?
A. Orientation is following a bearing, while navigation is setting or adjusting a bearing. B. Orientation is the ability to find true east, navigation is the ability to find a bearing while crossing water. C. Orientation is following the sun in the day as starling do, while navigation is following a bearing with a small amount of magnetite, which is found in the heads of some migratory birds. D. Orientation is adjusting a bearing, while navigation is actually following a bearing. E. Orientation and navigation are used interchangeably when referring to avian migrations.