Antibiotics have ____ cells as their targets.
A. animal
B. eukaryotic
C. fungus
D. bacterial
D. bacterial
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In which of the following organisms does blood flow from the pulmocutaneous circulation to the heart before circulating through the rest of the body?
A) annelids B) molluscs C) fishes D) frogs E) insects
In Drosophila, the hunchback gene encodes a protein (HB) that has a role in the development of the thorax. In the zygote and embryo, the expression of hunchback is stimulated by high concentrations of Bicoid protein. Which of the following is accurate about the expression of hunchback in the Drosophila embryo?
A. The HB protein is produced throughout the embryo. B. The HB protein is produced only in the anterior half of the embryo. C. The HB protein is produced only in the posterior half of the embryo. D. The HB protein is produced in the middle of the embryo; but is not produced in the anterior or posterior end. E. No HB protein is produced in the embryo.
Which example illustrates how “maximum likelihood” is used by systematists?
a. Assigning humans and chimpanzees to a less inclusive taxon b. Using the simplest explanation necessary to interpret the data c. Establishing the membership in a clade using the phenetic approach d. Distinguishing shared ancestral characteristics and shared derived characters e. Using probability to determine that the nucleotide sequences in DNA and RNA change at a constant rate over time
Allele that exerts its phenotypic effect only in the homozygote; its expression is masked by a dominant allele.
What will be an ideal response?