Humans differ from each other by 1 in 1000 to 1 in 5000 nucleotides, while chimpanzees differ from each other by 1
in 500 nucleotides. This suggests that _____.
a. humans are a younger species
b. humans are an older species
c. humans descended directly from chimpanzees
d. chimpanzees descended directly from humans
e. chimpanzees and humans have identical proteomes
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
A drug, colchicine, can be added to cells in culture and it stops the polymerization of microtubules. What effect would this have on mitosis?
A. It would slow or block mitosis by interfering with the spindle apparatus function. B. It would speed up mitosis by increasing the rate of DNA replication. C. It would speed up mitosis by increasing the elongation rate of the dividing cell. D. It would slow or block mitosis by preventing DNA replication.
Which of the following is LEAST associated
with blood tissue?
a. plasma b. platelets c. oxygen d. temperature homeostasis e. fibroblasts
If a population was in Hardy-Weinberg equilibrium, then ________ would occur in that population.
A. no evolutionary changes B. an increase of recessive alleles C. directional selection D. natural selection E. assortive mating