The __________ niche is the broadest role that an organism can potentially have in a community
a. realized
b. fundamental
c. displaced
d. excluded
e. limited
B
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Although the specific mechanism of RNA interference has not been fully defined, it involves
A. double stranded RNA interference with mRNA. B. double stranded RNA interference with DNA. C. double stranded DNA interference with mRNA. D. double stranded mRNA interference with DNA.
Answer the following statements true (T) or false (F)
1. A recessive allele is one that is masked if a dominant allele is also present. 2. The most common allele for any trait is always the dominant allele. 3. Genotypes are the outward expression of an allele combination. 4. Mendel's law of segregation states that the two alleles of each gene are packaged into separate gametes. 5. Any dihybrid cross should theoretically yield a 3:1 phenotypic ratio.
The average human ejaculation contains
a. 120,000 to 400,000 sperm. b. 1,200,000 to 4,000,000 sperm. c. 12 million to 40 million sperm. d. 120 million to 400 million sperm. e. 1.2 billion to 4 billion sperm.
In some situations, the death rate of a population declines before the birth rate begins to decline. What can be concluded about the population?
A) The carrying capacity is being reached. B) The population is in a demographic transition. C) A density-dependent factor is in action. D) The population occurs in an industrialized nation.