In which of the stages below does the chromosome consist of two chromatids?
a. prophase and anaphase
b. metaphase, prophase, and anaphase
c. metaphase and prophase
d. metaphase, telophase, and prophase
e. metaphase, telophase, prophase, and anaphase
C
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Answer the following statements true (T) or false (F)
1. A stigma is an organelle that pumps water out of the cell. 2. Sexual spores are also known as conidia. 3. Classification of fungi is based on the type of conidia that they produce. 4. Protozoa that move by means of pseudopodia are in a category known as Sarcodina. 5. Fungi can cause both infectious diseases and microbial intoxications.
What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
Which of the following is false about a cell undergoing mitosis with 4 chromosomes?
A. During metaphase there are 4 chromosomes B. During prophase the homologous chromosomes line up and cross-over C. During metaphase there are 4 centromeres D. During anaphase there are 8 DNA molecules
Three groups of cyclists consumed three different types of diets: high-carbohydrate; a diet mixed in carbohydrates, fat, and protein; or a diet higher in protein and fat
The average time each group could spend cycling over a six-hour period is shown in the above graph. What conclusion from the data would help an athlete or trainer improve performance? A) Endurance is entirely related to diet. B) Maintaining elevated blood sugar improves performance. C) An early 50 percent drop in blood glucose is associated with improved endurance. D) Diet is not at all related to endurance.