An example of a secondary sexual characteristic in males is spermatogenesis
____________________ Indicate whether the statement is true or false.
F, primary
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When Mendel crossed purple-flowered pea plants with white-flowered pea plants, he never got offspring with flowers that had an intermediate color. This was counter to the theory of
A. independent assortment. B. blending inheritance. C. direct transmission of traits. D. segregation of alleles. E. continuous variation of traits.
Some organisms are not able to live in an environment where there is oxygen; these types of organisms
are called obligate anaerobes. Which of the following proposals is the most likely for how they survive without oxygen?
a. They are able to survive using less energy than aerobes. b. All of their ATP is imported into the cell from an external source. c. Sulfur is used instead of oxygen because it is chemically similar. d. These organisms use photosynthesis to produce energy. e. Their mitochondria are damaged, and consequently they are short-lived.
Which lineage of Echinoderms is made up of about 950 species of sea urchins and sand dollars, which have their ossicles fused into solid tests that restrict flexibility but provide excellent protection?
a. Holothuroidea b. Crinoidea c. Asteroidea d. Echinoidea
Which of the following is found in RNA but not DNA?
A) adenine B) cytosine C) deoxyribose D) guanine E) uracil