How do eukaryotic plant and animals cells differ from one another?
A. Animal cells have mitochondria and plant
cells have chloroplasts.
B. Plant cells have a vacuole and animals
cells don't.
C. Animal cells have endoplasmic reticulum
and plant cells don't.
D. Animal cells have a plasma membrane
and plant cells have a cell wall.
Answer Key: B
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Calvin Bridges, an associate of Thomas Hunt Morgan's, found further evidence that genes were located on chromosomes. Which of the following is not a component of his study?
A. He crossed white-eyed females (XwXw) with red-eyed males (XWY). B. The F1 progeny were mostly the red-eyed males and white-eyed females expected. C. A few rare white-eyed females and red-eyed males were observed, which he called primary exceptionals. D. He proposed that the rare white-eyed females were the result of abnormal chromosome number. E. Abnormal chromosome number was a result of nondisjunction in the female fly.
An essential nutrient __________
a. is produced in high quantities in the body b. is produced in small quantities in the body c. must be obtained through the diet d. is a rich source of minerals
The gross reproductive rate is
A) the total number of offspring born to a population. B) the total number of offspring born to a population each year. C) the average number of female offspring born in a year. D) the average number of female offspring born to her over her lifetime.
The retina contains a type of photoreceptor (non-Rod and non-Cone) that is slowly excited by light signals received through the photopigment (A)______ which is (B)___________.
a. (A) melatonin, (B) G protein coupled receptor b. (A) carotenoid, (B) steroid hormone receptor c. (A) melanopsin, (B) G protein coupled receptor d. (A) carotenoid, (B) small GTPase