Why are green algae placed in the kingdom Protista, while plants are given their own kingdom?
A. Green algae have a cell wall of chitin, while plants have cell walls of cellulose.
B. Plants enclose and protect the embryo within the female plant, while green algae do not.
C. All plants are vascular, while all green algae are nonvascular.
D. The green algae use chlorophyll a, while plants use chlorophyll b.
E. Algae are sporophytes that reproduce only asexually, while plants are gametophytes and reproduce sexually.
Answer: B. Plants enclose and protect the embryo within the female plant, while green algae do not.
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All of the following must be overcome by an opportunistic fungal species as it attempts to establish infection in a new host EXCEPT
A. immune factors such as IgA, complement, and white blood cells. B. non-optimal pH for fungal growth. C. presence of nutrients. D. the presence of normal microbiota.
In a certain breed of chicken, two genes control color. A dominant allele (I) inhibits the expression of
any color gene (C). A second recessive gene (c) results in albinism when homozygous (cc). Give the F2 phenotypic ratio of a colored chicken ii CC with a white II cc. What will be an ideal response?
Some researchers have hypothesized that type II diabetes mellitus is caused by a mitochondrial defect. Which of the following would be the best way for them to study mitochondrial differences in fresh tissue samples from diabetic and nondiabetic mice?
A) Mitochondria could be identified and isolated from other cellular components using immunofluorescence microscopy in both tissues. B) Mitochondria are the only organelles that survive tissue homogenization, thus both tissues could be homogenized to study the mitochondria. C) Mitochondria from both tissues could be isolated from other cellular components by using proteolytic enzymes to break down other cellular structures. D) Mitochondria from both tissues could be isolated from other cellular components by fractionating tissue homogenate using differential centrifugation followed by density gradient centrifugation. E) Mitochondria can not be separated from whole cells without damaging them.
Hypophosphatemia (vitamin D—resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome
What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia? A) All of their daughters and none of their sons exhibit hypophosphatemia. B) Fifty percent of their daughters and fifty percent of their sons exhibit hypophosphatemia. C) All of their sons and none of their daughters exhibit hypophosphatemia. D) Twenty-five percent of their offspring exhibit hypophosphatemia.