A male patient is tall and has some gynecomastia along with a low sperm count. During infertility testing, he was found to have a 47,XXY karyotype. Which disorder is consistent with these findings?
A. Normal male
B. Turner syndrome
C. Klinefelter syndrome
D. Testicular feminization syndrome
C) klinefelter syndrome
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Prior to the Mesozoic Era, the primary photosynthesizers in the ocean were the cyanobacteria and the diatoms
A. true B. false
Paleobotanists often examine fossils of extinct plants and their seeds to determine the dominant biome of the area at the time when the fossil was formed. You were examining a seed that showed signs of being from grasses well-adapted to long periods without rain. The strata in which it was found showed no trees but many grasses and other plants with hard, drought-resistant seeds. Given what you know about the biomes, in which of the following would you expect to find this plant?
a. tropical wet forest b. arctic tundra c. savanna d. boreal forest
Which of the following hormones is produced only
when a woman is pregnant? a. testosterone b. gonadotropic-releasing hormone c. human chorionic gonadotropin d. estrogen e. progesterone
A wolf that feeds on moose and elk would be classified within which trophic level?
A. Secondary carnivore B. Detritivore C. Primary producer D. Herbivore E. Primary carnivore