Enzymes present in the lumen of the Golgi apparatus are responsible for modifying proteins and lipids. What is the likely origin of these enzymes?
A. free ribosomes
B. the rough endoplasmic reticulum
C. the smooth endoplasmic reticulum
D. the cytosol
Answer Key: B
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Which of the following is (are) true in plants? I) Mitosis occurs in gametophytes to produce gametes. II) Meiosis occurs in sporophytes to produce spores. III) The gametophyte is within the flower in angiosperms
A) only I B) only II C) only III D) only I and II E) I, II, and III
Which of the following is the best example of how we can separate the effects of genes and the environment on the expression of a complex trait?
A. About 80% of an individual's height is determined by genes and 20% by environment. B. For identical twins raised in the same environment, height should not differ by more than 20%. C. In a group of individuals of the same sex, about 80% of the variation in height among individuals is due to genetic differences and 20% is due to environmental differences. D. If one individual is 60 inches tall and another is 70 inches tall, they differ in about 80% of their genes. E. None of these choices accurately illustrate how we can separate the effects of genes and the environment on the expression of a complex trait.
Benthic algae are found
A. near the ocean shore. B. floating on the ocean surface. C. only in fresh water. D. in the deep parts of the ocean.
An example of a nonspecific chemical barrier to infection would be
A) unbroken skin B) lysozyme in saliva C) cilia in respiratory tract D) all of these