Sharks, rays, and skates belong to what group?
a. lobe-finned fish
b. ray-finned fish
c. cartilaginous fish
d. bony fish
e. reptiles
c
You might also like to view...
Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the similarities between the two forms of development?
A) Both plants and animals develop from a process of single fertilization. B) Both plants and animals produce specialized tissues through irreversible processes of determination and differentiation. C) Both plants and animals produce gametes via meiosis followed by mitosis of haploid cells. D) Both plant and animal development depend on precise control of gene expression in time and in space.
What type of thinking is required?
What will be an ideal response?
In catabolite repression systems of some Gram-positive bacteria, such as Bacillus subtilis, transcription of catabolic operons is regulated by CcpaA (catabolite control protein A) rather than cAMP. Propose a hypothesis to explain the preferential use of glucose in the presence of a second sugar such as sucrose by Bacillus subtilis.
A. CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when glucose, but not lactose, is present. B. CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when both sugars are present. C. CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when both sugars are present. D. CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when lactose, but not glucose, is present.
Researchers have discovered that there is a small remnant population of endangered bluegrass left in a small prairie plot outside of Kansas City. If there are approximately 850 individuals in the cohort, how many individuals can the researchers expect to find alive at the end of the summer, 6 months later?
A. approximately 330 B. approximately 1,000 C. approximately 700 D. approximately 45 E. None of the individuals will be alive 6 months later.