These cells have not yet completed determination or differentiation. They have the potential to develop into many different cell types.
A. germinal cells
B. core cells
C. stem cells
D. red marrow cells
C. stem cells
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The transport of two molecules across the cell membrane in different directions is called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true about the bacterium P. aeruginosa?
a. It contains many mitochondria because it actively divides. b. It has a cell wall. c. All its genetic material is contained in a circular plasmid. d. It is a eukaryote
When DDT was first introduced, insects were
very susceptible to it. The development of resistance to DDT by insects was the result of a. special creation. b. natural selection of forms that expressed genes for resistance. c. the high biotic potential of insects. d. a naturally occurring example of inheritance of acquired characteristics. e. mutation induced by DDT
What is the difference between a gene and an allele?
A gene is a form of a trait, and alleles make up genes. A gene is a sequence of bases in a DNA molecule, and an allele is an alternative version of a gene that codes for a different, but related, feature. A gene is a sequence of bases in a DNA molecule, and an allele is an alternative version of a gene that codes for the same feature. A gene describes a chromosome, and an allele describes an exact location of a gene on a chromosome. An allele and a gene are the same thing.